43 Accession number: 05469472162

Title: Determination of trace amounts of cobalt using 1-(5-bromo-2-pyridylazo)-2- naphthol-6-sulfonicAcid-Cu(II) -Co(II) competitive replacement complexation
Authors: Gao, Hong-Wen
First author affiliation: Key Laboratory of Yangtze Water Environment, Tongji University, Ministry of Education, Shanghai, 200092, China
Serial title: Journal of AOAC International
Abbreviated serial title: J AOAC Int
Volume: v 88
Issue: n 5
Issue date: September/October 2005
Publication year: 2005
Pages: p 1433-1439
Language: English
ISSN: 1060-3271
CODEN: JAINEE
Document type: Journal article (JA)
Publisher: AOAC International, Gaithersburg, MD 20877-2417, United States
Abstract: The chromophore 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid (BPANS) has been used to sensitively complex Cu(II) and Co(II) in aqueous solution at pH 9.43. The spectral correction technique was applied to characterize the complexes, and results showed that both Cu(BPANS)2 and Co(BPANS) 2 were formed. Trace Co2+ replaced the Cu(II) in the Cu-BPANS complex, so the competitive replacement complexation (CRC) was used to improve the analytical selectivity. A novel light-absorption ratio variation approach (LARVA) was described as one of the most sensitive methods. The combination of CRC and LARVA was applied to the quantitative detection of Co(II) at the ng/mL level. The limit of detection was only 2.0 ng/mL Co, and the analysis of water samples demonstrated satisfactory results.
Number of references: 30
Ei main heading: Cobalt
Ei controlled terms: Chromophores | Cobalt compounds | Trace analysis | Complexation | Spectroscopic analysis | Light absorption
Uncontrolled terms: Spectral correction technique | Competitive replacement complexation | Quantitative detection | Light-absorption ratio variation approach (LARVA)
Ei classification codes: 549.3 Others, including Bismuth, Boron, Cadmium, Cobalt, Mercury, Niobium, Selenium, Silicon, Tellurium & Zirconium | 804.1 Organic Compounds | 801 Chemistry | 802.2 Chemical Reactions | 741.1 Light/Optics
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2005 Elsevier Engineering Information, Inc.

42 Accession number: 05329287815

Title: Sensitive determination of anionic surfactants in water with trans-4-[4 prime -(N-methyl-N-hydroxylethylamino)-cinnamyl-N-9-(4 prime -(2, 2 prime :6 prime ,2 double prime -terpyridine))-phenylmethylene]pyridine bromide by the light-absorption ratio variation approach
Authors: Yang, Jia-Xiang; Gao, Hong-Wen; Hu, Zhang-Jun; Jiang, Min-Hua
First author affiliation: Key Laboratory of Yangtze Water Environment, Tongji University, Ministry of Education, Shanghai, 200092, China
Serial title: Journal of AOAC International
Abbreviated serial title: J AOAC Int
Volume: v 88
Issue: n 3
Issue date: May/June 2005
Publication year: 2005
Pages: p 866-872
Language: English
ISSN: 1060-3271
CODEN: JAINEE
Document type: Journal article (JA)
Publisher: AOAC International, Gaithersburg, MD 20877-2417, United States
Abstract: The light-absorption ratio variation approach was described and applied to the determination of anionic surfactants (AS) in water with a novel chromophore, trans 4-[4 prime -(N-methyl-N-hydroxylethylamino)-cinnamyl-N-9-(4 prime -(2, 2 prime :6 prime ,2 double prime -terpyridine))-phenylmethylene]pyridine bromide (BTMHCTPP). The complexations between BTMHCTPP and sodium dodecyl sulfate (SDS) and sodium dodecylbenzenesulfonate (SDBS) at pH 3.85 were characterized by the break point approach. Results have shown that both 1BTMHCTPP:1SDS and 1BTMHCTPP:1SDBS complexes were formed, and that ΔAr (ΔAr = light-absorption ratio variation) is linear for the range of AS between 0.05 and 1.00 mg/L. The limits of detection (3σ) are 0.045 mg/L for SDS and 0.040 mg/L for SDBS. The complexation is selective in the presence of EDTA, and it has been applied to the analysis of water samples with satisfactory results.
Number of references: 12
Ei main heading: Water analysis
Ei controlled terms: Negative ions | Organic compounds | Light absorption | Complexation | Spectrophotometry | Chromophores | Oxidation | Absorption | pH effects | Nuclear magnetic resonance | Sodium compounds
Uncontrolled terms: Anionic surfactants | Light-absorption ratio variation approach (LARVA) | Chemical structures | Sodium dodecyl sulfate (SDS)
Ei classification codes: 445.2 Water Analysis | 801 Chemistry | 804.1 Organic Compounds | 741.1 Light/Optics | 802.2 Chemical Reactions | 941 Acoustical and Optical Measuring Instruments | 802.3 Chemical Operations | 801.1 Chemistry, General | 931.2 Physical Properties of Gases, Liquids & Solids | 804.2 Inorganic Compounds
Treatment: Theoretical (THR); Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2005 Elsevier Engineering Information, Inc.

41 Accession number: 05409400936

Title: Direct, sensitive determination of trace amounts of dissolved ferric iron in natural water by light absorption ratio variation spectrometry
Authors: Gao, Hong-Wen; Chen, Ling; Yang, Qiao-Zhi
First author affiliation: Key Laboratory of Yangtze Water Environment, Tongji University, Ministry of Education, Shanghai-200092, China
Serial title: Journal of AOAC International
Abbreviated serial title: J AOAC Int
Volume: v 88
Issue: n 4
Issue date: July/August 2005
Publication year: 2005
Pages: p 1231-1235
Language: English
ISSN: 1060-3271
CODEN: JAINEE
Document type: Journal article (JA)
Publisher: AOAC International, Gaithersburg, MD 20877-2417, United States
Abstract: The chromophore eriochrome cyanine R (ECR) was used to sensitively coordinate Al(III) and Fe(III) in the presence of cetylpyridinium chloride (CPC) at pH 4.8. Trace amounts of Fe(III) can displace Al(III) from the Al(ECR)(CPC) ternary complex to form the Fe(ECR)(CPC) complex. The composition of the complexes was determined by the break point approach. The competitive displacement complexation was sensitive and highly selective, even if no masking reagent was added. An ongoing novel spectrophotometry, named the light-absorption ratio variation approach, was applied to the direct determination of Fe(III) in natural water with recovery between 92.5 and 106%. The detection limit was only 9 ng/mL Fe(III).
Number of references: 19
Ei main heading: Trace analysis
Ei controlled terms: Iron compounds | Dissolution | Chromophores | Nitrogen compounds | Complexation | Ternary systems | Spectrophotometry | Molecular vibrations | Light absorption
Uncontrolled terms: Ferric iron | Eriochrome cyanine R (ECR) | Cetylpyridinium chloride (CPC) | Ternary complexes
Ei classification codes: 801 Chemistry | 804.2 Inorganic Compounds | 802.3 Chemical Operations | 804.1 Organic Compounds | 802.2 Chemical Reactions | 941 Acoustical and Optical Measuring Instruments | 801.4 Physical Chemistry | 931.3 Atomic & Molecular Physics | 741.1 Light/Optics
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2005 Elsevier Engineering Information, Inc.

40 Accession number: 04538758915

Title: Application of light-absorption ratio variation approach as an optimum spectrophotometry to determination of Mn(II) in ng ml-1 level using a competitive replacement complexation
Authors: Gao, Hong-Wen; Zhang, Sheng-Yi; Wang, Hong-Yan; Xia, Si-Qing; Zhang, Ya-Lei
First author affiliation: Key Lab. Changjiang River W.E.M.E., Sch. of Environ. Sci. and Eng., Tongji University, Shanghai 200092, China
Serial title: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Abbreviated serial title: Spectrochim. Acta Part A Mol. Biomol. Spectrosc.
Volume: v 61
Issue: n 3
Publication year: 2005
Pages: p 447-454
Language: English
ISSN: 1386-1425
CODEN: SAMCAS
Document type: Journal article (JA)
Publisher: Elsevier, Amsterdam, 1000 AE, Netherlands
Abstract: The light-absorption ratio variation approach (LARVA) which produces an outstandingly increasing of analytical sensitivity was applied to the quantitative detection of ultramicro amounts of Mn(II) by light-absorption spectrometry using the competitive replacement complexation among 1,5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan (DSPCF), Zn(II) and Mn(II) in the presence of o-phenanthroline (OPTL). Not only masks OPTL foreign metal ions but also seriously sensitize the competitive complexation. All the binary and ternary complexes were characterized by the break point approach. Results have shown that the limit of detection (3δ) of Mn(II) is only 0.7 ng ml -1. This method has been applied to analysis of water quality with satisfactory results. ? 2004 Elsevier B.V. All rights reserved.
Number of references: 14
Ei main heading: Manganese compounds
Ei controlled terms: Complexation | Light absorption | Photometry | Ternary systems | Absorption spectroscopy
Uncontrolled terms: Competitive replacement complexation | Flow-injection | Ternary complexes | Metal ions
Ei classification codes: 804.1 Organic Compounds | 802.2 Chemical Reactions | 741.1 Light/Optics | 941.4 Optical Variables Measurements | 531.1 Metallurgy
Treatment: Experimental (EXP)
DOI: 10.1016/j.saa.2004.03.021
Database: Compendex
Compilation and indexing terms, ? 2005 Elsevier Engineering Information, Inc.
Full-text and Local Holdings Links

39 Accession number: 04057995071

Title: Langmuir Aggregation of Chromophore in Protein Macromolecule and Its Application - Interaction of Phloxine B with Proteins
Authors: Gao, Hong-Wen; Chen, Yun-Sheng
First author affiliation: Coll. of Chem. and Chem. Engineering, Anhui University, Hefei 230039, China
Serial title: Kao Teng Hsueh Hsiao Hua Heush Hsueh Pao/ Chemical Journal of Chinese Universities
Abbreviated serial title: Kao Teng Hsueh Hsiao Hua Heush Hsueh Pao
Volume: v 23
Issue: n 5
Issue date: May 2002
Publication year: 2002
Pages: p 827
Language: Chinese
ISSN: 0251-0790
CODEN: KTHPDM
Document type: Journal article (JA)
Publisher: Higher Education Press
Abstract: The microphase adsorption-spectral correction(MASC) technique was applied to investigation of the interaction of phloxine B(PB) with proteins. The aggregation of PB obeys the Langmuir monolayer adsorption and it has been used in the determination of protein solution at pH 3. 8. The results show that the adsorption ratios of PB to proteins are n(PB) : n(BSA) = 1 : 155, n(PB) : n(OVA) = 1 : 58, n(PB) : n(Mb) = 1 : 18, their adsorption constants are 2.17×104, 1. 18×104, 3. 25×105 and their real molar absorptivities eε555 nmBSA-PB = 7. 94×106, ε555 nmOVA-PB = 3. 39×106, ε555 nmMb-PB = 1. 21×106 L [Closed Circle] mol-1 [Closed Circle] cm-1. The interaction of PB with proteins is sensitive and selective in the presence of EDTA. For analysis of samples, the recovery of protein is between 96. 7% and 107% and the relative standard deviation 4. 6%.
Number of references: 23
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

38 Accession number: 04228181980
Title: Aggregation of a dye on a surfactant: Interaction of coomassie brilliant blue G250 with cetyltrimethylammonium bromide and determination of the cationic surfactant in water
Authors: Gao, Hong-Wen; Zheng, Li-Xin; Mei, Hou-Dong
First author affiliation: Stt. Key Lab. Poll. Contr./Rsrc. R., Tongji University, Shanghai 200092, China
Serial title: Instrumentation Science and Technology
Abbreviated serial title: Instrum Sci Technol
Volume: v 32
Issue: n 3
Issue date: May 2004
Publication year: 2004
Pages: p 271-280
Language: English
ISSN: 1073-9149
CODEN: ISCTEF
Document type: Journal article (JA)
Publisher: Marcel Dekker Inc.
Abstract: The interaction of Coomassie brilliant blue G250 (CBBG) with cetyltrimethylammonium bromide (CTAB) has been investigated at pH 9.50 by the microsurface binding-spectral correction (MSASC) technique. The experiments confirmed that the aggregation of CBBG on CTAB obeys the Langmuir isothermal adsorption. The aggregate was characterized. Results showed that the monomer aggregate, CBBG2CTAB was formed at 30°C with a binding constant of 6.46 × 103. The aggregation was applied to the quantitative determination of the cationic surfactant in water samples with satisfactory results.
Number of references: 17
Ei main heading: Surface active agents
Ei controlled terms: Agglomeration | Dyes | Water | Adsorption | Monomers | Monolayers | Proteins | Positive ions
Uncontrolled terms: Langmuir aggregation | Coomassie brilliant blue G250 | Cetyltrimethylammonium bromides | Determination of cationic surfactants
Ei classification codes: 803 Chemical Agents and Basic Industrial Chemicals | 802.3 Chemical Operations | 804.2 Inorganic Compounds | 813.2 Coating Materials | 804.1 Organic Compounds | 801 Chemistry
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

37 Accession number: 04178125946
Title: Aggregation of Dye on Polymer: Naphthochrome Green/PVP/Cu(II) Interaction and Determination of Cu Traces
Authors: Gao, Hong-Wen; Qian, Yan; Kong, Xiang-Tai; Xia, Si-Qing
First author affiliation: Stt. Key Lab. Poll. Contr./R.R., Sch. of Environ. Sci./Engineering, Tongji University, Shanghai 200092, China
Serial title: Instrumentation Science and Technology
Abbreviated serial title: Instrum Sci Technol
Volume: v 32
Issue: n 2
Issue date: March 2004
Publication year: 2004
Pages: p 195-205
Language: English
ISSN: 1073-9149
CODEN: ISCTEF
Document type: Journal article (JA)
Publisher: Marcel Dekker Inc.
Abstract: The interaction of naphthochrome green (NCG) with polyvinylpyrrolidone (PVP) and the complexation of NCG with Cu on PVP chain were investigated in basic medium by the spectral correction technique. The binding of NCG on PVP by the electrostatic attraction obeys the Langmuir isothermal adsorption in aqueous solution. Both the NCG-PVP aggregate and Cu-NCG-PVP ternary complex was characterized at 20°C, 40°C, and 60°C. The presence of PVP sensitized the complexation between Cu and NCG. This novel approach is sensitive and selective in the presence of citrate and has been applied to the quantitative detection of Cu traces in samples with satisfactory recovery.
Number of references: 23
Ei main heading: Dyes
Ei controlled terms: Organic polymers | Agglomeration | Complexation | Amino acids | Thin films | Hydrogen bonds | Adsorption | Electrostatics | Adsorption isotherms | Sensitivity analysis
Uncontrolled terms: Spectral correction techniques | Polyvinylpyrrolidone | Napthochrome green | Langmuir aggregation | Determination of Cu traces
Ei classification codes: 803 Chemical Agents and Basic Industrial Chemicals | 815.1.1 Organic Polymers | 802.3 Chemical Operations | 802.2 Chemical Reactions | 804.1 Organic Compounds | 801.4 Physical Chemistry | 701.1 Electricity: Basic Concepts & Phenomena | 641.1 Thermodynamics | 921 Applied Mathematics
Treatment: Theoretical (THR); Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

36 Accession number: 04128073442
Title: Light-absorption ratio variation approach to determination of nickel (II) in ng/ml level with 1, 5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan
Authors: Gao, Hong-Wen; Xia, Si-Qing; Wang, Hong-Yan; Zhao, Jian-Fu
First author affiliation: Sch. of Environ. Sci. and Eng., Tongji University, State Key Lab. Poll. Contr. Rsrc. R., Shanghai 200092, China
Serial title: Water Research
Abbreviated serial title: Water Res.
Volume: v 38
Issue: n 6
Issue date: March 2004
Publication year: 2004
Pages: p 1642-1650
Language: English
ISSN: 0043-1354
CODEN: WATRAG
Document type: Journal article (JA)
Publisher: Elsevier Ltd
Abstract: The light-absorption ratio variation approach (LARVA) has been described and applied to the quantitative detection of ultramicro amounts of Ni by spectrophotometry, which raises notably the detection sensitivity. The complexation between 1, 5-di(2-hydroxy-5-sulfophenyl)-3-cyanoformazan (DSPCF) and Ni(II) at pH 9.11 was investigated and the binary complex was characterized by the spectral correction technique. Results have shown that ΔA r-1 (ΔAr - light-absorption ratio variation) is linear in the range of Ni(II) between 5 and 200 ng/ml. The limit of detection (3σ) of Ni(II) is only 1.3 ng/ml. The complexation is selective in the presence of fluoride, hexametaphosphate, ethylene diamine tetraacetate and thioglycollic acid. It has been applied to analysis of water quality with satisfactory results. ? 2004 Elsevier Ltd. All rights reserved.
Number of references: 25
Ei main heading: Nickel
Ei controlled terms: Light absorption | Spectrophotometry | Water quality | Correlation methods
Uncontrolled terms: Spectral correction technique
Ei classification codes: 548.1 Nickel | 741.1 Light/Optics | 941 Acoustical and Optical Measuring Instruments | 445.2 Water Analysis | 922.2 Mathematical Statistics
Treatment: Theoretical (THR)
DOI: 10.1016/j.watres.2003.11.030
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

35 Accession number: 04118059224
Title: Investigation of Interaction of Proflavine and Naphthol Red in Nucleic Acids by Light-Absorption Spectrometry
Authors: Zhao, Jian-Fu; Xia, Si-Qing; Gao, Hong-Wen
First author affiliation: Stt. Key Lab. Poll. Contr./Rsrc. R., Sch. of Environ. Sci./Engineering, Tongji University, Shanghai 200092, China
Serial title: Journal of Macromolecular Science - Pure and Applied Chemistry
Abbreviated serial title: J Macromol Sci Pure Appl Chem
Volume: v 41 A
Issue: n 1
Issue date: January 2004
Publication year: 2004
Pages: p 63-76
Language: English
ISSN: 1060-1325
CODEN: JSPCE6
Document type: Journal article (JA)
Publisher: Marcel Dekker Inc.
Abstract: The formation of the double electrostatic films in nucleic acid will cause the aggregation of small molecules on it by a non-covalent bond. The interaction of the dyes: proflavine (PLV) and naphthol red (NR) with nucleic acids [calf thymus (ct) DNA and yeast (y)RNA] in acidic medium was investigated by the microsurface adsorption-spectral correction (MSASC) technique. Results showed that the aggregation of PLV and NR on DNA and RNA agrees with the Langmuir isothermal adsorption. The maximal binding numbers of PLV is 0.85 with ctDNA-P and 0.50 with yRNA-P and those of NR 0.12 with ctDNA-P and 0.07 with yRNA-P. Their binding constants K are 8.13 × 104, 2.15 × 105, 2.20 × 105, and 2.05 × 105, respectively. The effect of ionic strength and temperature on the aggregation was made. The aggregation of PLV and NR in nucleic acids has been tried to apply to the quantitative detection of nucleic acids.
Number of references: 29
Ei main heading: Dyes
Ei controlled terms: Nucleic acids | Light absorption | Adsorption isotherms | Ionic strength | Agglomeration | Spectrometry
Uncontrolled terms: Microsurface adsorption spectral correction (MSASC) technique | Electrostatic films | Proflavine | Napthol red | Light absorption spectrometry
Ei classification codes: 803 Chemical Agents and Basic Industrial Chemicals | 461.2 Biological Materials | 801.2 Biochemistry | 804.1 Organic Compounds | 741.1 Light/Optics | 801.4 Physical Chemistry | 802.3 Chemical Operations | 941.4 Optical Variables Measurements
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

34 Accession number: 04118059441
Title: Spectrophotometric Titration of Iron Using Eriochrome Blue Black R and Cetyltrimethylammonium Bromide
Authors: Zhao, Jian-Fu; Xia, Si-Qing; Gao, Hong-Wen; Zhang, Ya-Lei
First author affiliation: Stt. Key Lab. Poll. Contr./Rsrc. R., Sch. of Environ. Sci./Engineering, Tongji University, Shanghai 200 092, China
Serial title: Instrumentation Science and Technology
Abbreviated serial title: Instrum Sci Technol
Volume: v 32
Issue: n 1
Issue date: January 2004
Publication year: 2004
Pages: p 77-91
Language: English
ISSN: 1073-9149
CODEN: ISCTEF
Document type: Journal article (JA)
Publisher: Marcel Dekker Inc.
Abstract: The ternary interaction of eriochrome blue black R (EBBR) with cetyltrimethylammonium bromide (CTAB) was investigated. Cetyltrimethylammonium bromide micelle provides complexation between Fe and EBBR with a catalytic field so as to sensitize the complexation. The aggregation of EBBR on CTAB is in accord with the Langmuir adsorption isotherm. The ternary interaction was characterized at pH 6.5 by the spectral correction technique and the Langmuir adsorption isotherm and the aggregate Fe ·EBBR6CTAB 78 was formed. The reaction was applied to the sensitive determination of Fe traces in samples with satisfactory results.
Number of references: 30
Ei main heading: Ammonium compounds
Ei controlled terms: Iron | Adsorption isotherms | Ternary systems | Chemical bonds | Micelles | Surface active agents | Titration | Spectrophotometry | Spectrum analysis
Uncontrolled terms: Cetyltrimethylammonium bromide | Erichrome blue black R | Spectral correction technique | Langmuir adsorption isotherm | Determination of iron
Ei classification codes: 804.2 Inorganic Compounds | 545.1 Iron | 641.1 Thermodynamics | 531.1 Metallurgy | 801.4 Physical Chemistry | 801.3 Colloid Chemistry | 803 Chemical Agents and Basic Industrial Chemicals | 941 Acoustical and Optical Measuring Instruments
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

33 Accession number: 03497770806
Title: Interaction of Spectral Probe with Biomacromolecule: Safranin T-Nucleic Acid Assembly
Authors: Gao, Hong-Wen; Zhao, Jian-Fu
First author affiliation: Stt. Key Lab. Poll. Contr./Rsrc. R., Sch. of Environ. Sci./Engineering, Tongji University, Shanghai-200092, China
Serial title: Journal of Trace and Microprobe Techniques
Abbreviated serial title: J Trace Microprobe Tech
Volume: v 21
Issue: n 4
Issue date: November 2003
Publication year: 2003
Pages: p 615-625
Language: English
ISSN: 0733-4680
CODEN: JTMTDE
Document type: Journal article (JA)
Publisher: Marcel Dekker Inc.
Abstract: The microsurface-spectral correction (MSASC) technique has been described and applied to study the assembly of safranin T on nucleic acids at pH 2.21. The formation of the electrostatic film in nucleic acids causes the aggregation of small molecules and the aggregation obeys the Langmuir isothermal adsorption. The characterization of the assembly complexes was made. Results have showed that the maximal assembly number of ST is 1.62 on each phosphate in deoxyribonucleic acid and 0.84 on each phosphate in ribonucleic acid and the binding constants of the complexes are KDNA-P-sT = 2.11 × 104 and KRNA-P-ST = 1.41 × 104L mol -1. This aggregation was applied to the quantitative detection of nucleic acids in samples with satisfactory results.
Number of references: 25
Ei main heading: DNA
Ei controlled terms: Biofilms | pH effects | Agglomeration | Adsorption isotherms | Phosphates | Adsorption | Positive ions | Negative ions | Separation | Solutions | Monolayers
Uncontrolled terms: Electrostatic films | Binding constants | Assembly complexes | Spectral probes
Ei classification codes: 461.2 Biological Materials | 462.5 Biomaterials | 801.1 Chemistry, General | 802.3 Chemical Operations | 641.1 Thermodynamics | 804.2 Inorganic Compounds
Treatment: Theoretical (THR); Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

32 Accession number: 03407660909
Title: Interaction of non-spectral compound with biomacromolecule using spectral probing stain: dodecyl benzene sulfonate/brilliant cresyl blue B/protein system
Authors: Shen, Rong; Zheng, Li-Xin; Gao, Hong-Wen
Serial title: Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering
Abbreviated serial title: Guocheng Gongcheng Xuebao
Volume: v 3
Issue: n 4
Issue date: August 2003
Publication year: 2003
Pages: p 328
Language: Chinese
ISSN: 1009-606X
CODEN: CJPEB5
Document type: Journal article (JA)
Publisher: Science Press
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

31 Accession number: 04057981868
Title: Multiwavelength spectral correction for the simultaneous determination of Cu(II), Fe(II), and Zn(II) with 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid
Authors: Gao, Hong-Wen
First author affiliation: Anhui University, Sch. of Chem. and Chem. Engineering, Hefei 230039, China
Serial title: Journal of AOAC International
Abbreviated serial title: J AOAC Int
Volume: v 84
Issue: n 2
Issue date: March/April 2001
Publication year: 2001
Pages: p 532-536
Language: English
ISSN: 1060-3271
CODEN: JAINEE
Document type: Journal article (JA)
Publisher: AOAC International
Abstract: A new analytical method is described for the simultaneous determination of various components by multiwavelength spectrophotometry. Because of the influence of the free ligand and various complexes on spectrophotometric absorption, the spectral correction principle was used to establish the calculation matrix formula. The 3 sensitive reactions of Cu(II), Fe(II), and Zn(II), with 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid were studied at pH 10.5. In analyses of fortified samples, the recoveries of Fe, Zn, and Cu were between 93.0 and 103%, 87.0 and 108%, and 92.5 and 108%, respectively; the relative standard deviations for 5 determinations of Fe, Zn, and Cu in unfortified ore were 3.6, 5.8, and 4.5%, respectively.
Number of references: 8
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

30 Accession number: 03117393677
Title: Langmuir aggregation of eosin-Y in protein and its application
Authors: Gao, Hong-Wen; Zhao, Jian-Fu
First author affiliation: State Key Lab. Pollution Contr./R.R., Tongji University, Shanghai 200092, China
Serial title: Australian Journal of Chemistry
Abbreviated serial title: Aust. J. Chem.
Volume: v 55
Issue: n 12
Publication year: 2002
Pages: p 767-772
Language: English
ISSN: 0004-9425
CODEN: AJCHAS
Document type: Journal article (JA)
Publisher: CSIRO
Abstract: The microsurface adsorption-spectral correction (MSASC) technique is described and applied to the investigation of the interaction of eosin-Y (EOY) with proteins at pH 3.8. The microelectrostatic fields in proteins cause the aggregation of EOY and it obeys Langmuir isothermal adsorption. Results have shown that the binding ratio of EOY to bovine serum albumin (BSA), ovalbumin (OVA), concanavalin A (ConA), and human γ-globulin (γ-G) are 77: 1, 23: 1, 4: 1, and 83: 1, the adsorption constants of the complexes were calculated to be 2.82×106, 1.70×105, 1.80×105, and 2.49×104 M-1, and their molar absorptivities 3.20×106, 1.21×106, 1.35×105, and 5.27×106 L mol-1 cm-1 at 540 nm. The adsorption reaction has been applied to the quantitative detection of proteins in samples with satisfactory results.
Number of references: 32
Ei main heading: Proteins
Ei controlled terms: Agglomeration | Adsorption | Electrostatics | Adsorption isotherms | Chemical analysis
Uncontrolled terms: Microelectrostatics
Ei classification codes: 804.1 Organic Compounds | 802.3 Chemical Operations | 701.1 Electricity: Basic Concepts & Phenomena | 641.1 Thermodynamics | 801 Chemistry
Treatment: Applications (APP); Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

29 Accession number: 02266987838
Title: Langmuir aggregation of azocarmine B on cetyl trimethylammonium bromide and application
Authors: Gao, Hong-Wen; Yang, Jia-Xiang
First author affiliation: School of Chemistry/Chemical Eng., Anhui University, Hefei 230039, China
Serial title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Abbreviated serial title: Colloids Surf. A Physicochem. Eng. Asp.
Volume: v 205
Issue: n 3
Issue date: Jun 24 2002
Publication year: 2002
Pages: p 283-292
Language: English
ISSN: 0927-7757
CODEN: CPEAEH
Document type: Journal article (JA)
Publisher: Elsevier Science B.V.
Abstract: The microphase adsorption-spectral correction (MPASC) technique was described and applied to the study of the interaction of azocarmine B (ACB) with cetyl trimethylammonium bromide (CTAB). The synergism mechanism of CTAB was analyzed and discussed. The adsorption of ACB on CTAB at pH 9.2 obeys the Langmuir monolayer adsorption. The great electrostatic micellar aggregate (ACB·CTAB3)26 was formed, on which the Cu-ACB complex was formed rapidly in the aggregate formula (Cu·ACB·CTAB3)26. The adsorption constant of the CTAB-ACB aggregate and the stability constant of the Cu-ACB complex was determined to be 3.45×105 and 7.71×105, respectively. The analysis of the samples gave the satisfactory quantitative results. ? 2002 Elsevier Science B.V. All rights reserved.
Number of references: 20
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

28 Accession number: 01025530631
Title: Investigation of properties of rare earth complexes with dibromo-p-methyl-methylsulfonazo by spectral correction technique
Authors: Gao, Hong-Wen; Hong, Fa-Shui; Ye, Qing-Song
First author affiliation: Anhui Univ, Hefei, China
Serial title: Proceedings of the Indian Academy of Sciences: Chemical Sciences
Abbreviated serial title: Proc Indian Acad Sci Chem Sci
Volume: v 112
Issue: n 6
Issue date: Dec
Publication year: 2000
Pages: p 573-578
Language: English
ISSN: 0253-4134
CODEN: PIAADM
Document type: Journal article (JA)
Publisher: Indian Academy of Sciences, Bangalore, India
Abstract: The reactions were sensitive between seven rare earth (RE) metals Nd(III), La(III), Ce(III), Pr(III), Sm(III), Eu(III) and Gd(III) and dibromo-p-methyl-methylsulfonazo (DBMMSA) in acidic solution. The spectral correction method has been applied in the determination of properties of RE complexes instead of ordinary spectrophotometry. Composition ratios, real molar absorptivities (ε) and stepwise stability constants (K) of each of the RE complexes were determined easily because the method eliminated the absorption influence of excess of ligand on complex. Results showed that the cumulative K values of the complexes were between 3.91×1014 and 2.34×1028 and the real (not apparent) absorptivity between 8.85×104 and 2.12×105 l mol-1 cm-1 at 640 nm.
Abstract type: (Author abstract)
Number of references: 14
Ei main heading: Rare earth compounds
Ei controlled terms: Complexation | Spectrophotometry | Rate constants | Composition effects | Correlation methods
Uncontrolled terms: Spectral correction techniques | Molar absorptivities

Ei classification codes: 804.2 Inorganic Compounds | 802.2 Chemical Reactions | 944 Moisture, Pressure and Temperature, and Radiation Measuring Instruments | 801 Chemistry
Treatment: Theoretical (THR); Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

27 Accession number: 00085302083
Title: Investigation of properties of copper, ferrous complexes with 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulphonic acid and application of substitution reaction in metallic complex to selective determination of trace amounts of metal
Authors: Gao, Hong-Wen
First author affiliation: Anhui Univ, Hefei, China
Serial title: Talanta
Abbreviated serial title: Talanta
Volume: v 52
Issue: n 2
Issue date: Aug
Publication year: 2000
Pages: p 817-823
Language: English
ISSN: 0039-9140
CODEN: TLNTA2
Document type: Journal article (JA)
Publisher: Elsevier Science Inc., New York, NY, USA
Abstract: The report was the first to establish the new method for the selective determination of trace amounts of metal using the substitution reaction in metallic complex. The reactions between copper(II) and 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulphonic acid (BPANS) and between ferrous(II) and BPANS at pH 3.5 were studied. In absence of any masking reagent, the recommended method was selective in the determination of trace amounts of copper with Fe-BPANS complex as chromogenic reagent because copper(II) can substitute Fe from Fe-BPANS complex to form Cu-BPANS complex. The ordinary spectrophotometric method was unsuitable to the substitution reaction because the excess of Fe-BPANS complex had the high absorption and affected seriously the absorption of Cu-BPTANS complex. The spectral correction principle may eliminate the above influence to give the simple determination of the composition ratio, stepwise absorptivity (ε) and stability constant (K) of metal complex. For analysis of samples, the recovery of copper was between 96.5 and 106% with R.S.D. less than 5%.
Abstract type: (Author abstract)
Number of references: 15
Ei main heading: Trace analysis
Ei controlled terms: Copper | Bromine compounds | Organic acids | pH | Spectrophotometry | Absorption spectroscopy
Uncontrolled terms: Bromo pyridylazo naphthol sulfonic acid
Ei classification codes: 801 Chemistry | 544.1 Copper | 804.1 Organic Compounds | 801.1 Chemistry, General | 941 Acoustical and Optical Measuring Instruments
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

26 Accession number: 94031240996
Title: Determination of iodide in natural water by primary-secondary wavelengths. Cresol red catalytic spectrophotometry
Authors: Gao, Hongwen
First author affiliation: Huaibei Environmental Monitoring Cent, China
Serial title: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Abbreviated serial title: Guang Pu Xue Yu Guang Pu Fen Xi
Volume: v 13
Issue: n 6
Issue date: Dec
Publication year: 1993
Pages: p 109-112, 90
Language: Chinese
ISSN: 1000-0593
CODEN: GYGFED
Document type: Journal article (JA)
Abstract: Iodide (I-) can be found as the catalyst of the reaction of chloramine-cresol red (pH5.0). Na2S2O3 may control this reaction and make this solution (I-) appear yellow after sulfuric acid is added. The catalytic reaction consists of the fading of red color and the forming of yellow color. The primary-secondary wavelengths spectrophotometry is to make full use of the combined effect of the maximum absorption wavelengths of these two colors, so that the analytical sensitivity of I- can be increased obviously. This method is simple and rapid for use. The calculated model is stable and the precision and accuracy are satisfactory, hence this method is suitable for the analysis of natural clean water with I content >=0.002 mg I-/L.
Abstract type: (Edited author abstract)
Number of references: 3
Ei main heading: Water
Ei controlled terms: Iodine compounds | Spectrophotometry
Uncontrolled terms: Primary secondary wavelength | Catalytic spectrophotometry | Cresol red | Natural water | Iodide
Ei classification codes: 444 Water Resources | 801 Chemistry | 941.4 Optical Variables Measurements
Treatment: Experimental (EXP); Applications (APP)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

25 Accession number: 03227486186
Title: Langmuir aggregation of thionin on sodium dodecyl sulfate and application
Authors: Gao, H.; Zhang, P.
Serial title: Zhurnal Analiticheskoj Khimii
Abbreviated serial title: Zh Anal Khim
Volume: v 58
Issue: n 4
Publication year: 2003
Pages: p 366-372
ISSN: 0044-4502
CODEN: ZAKHA8
Document type: Journal article (JA)
Publisher: Maik Nauka
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

24 Accession number: 96103351690
Title: Updated spectrophotometric determination of trace cadmium in wastewater
Authors: Gao, Hongwen; Cui, Guowei; Liu, Yulin
Serial title: Shiyou Huagong/Petrochemical Technology
Abbreviated serial title: Shiyou Huagong
Volume: v 25
Issue: n 8
Issue date: Aug
Publication year: 1996
Pages: p 572
Language: Chinese, English
CODEN: SHHUE8
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

23 Accession number: 96023028286
Title: β-correction spectrophotometric determination of cadmium with cadion
Authors: Gao, Hongwen
Serial title: Chinese Journal of Geochemistry
Abbreviated serial title: Chin J Geochem
Volume: v 14
Issue: n 1
Publication year: 1995
Pages: p 93
Language: English
ISSN: 1000-9426
CODEN: CJGEEV
Document type: Journal article (JA)
Publisher: VSP Int Sci Publ, Zeist, Netherlands
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

22 Accession number: 95112926943
Title: β-correction spectrophotometric determination of silver in wastewater with malachite green
Authors: Gao, Hongwen
Serial title: Huanjing Kexue/Environmental Science
Abbreviated serial title: Huanjing Kexue
Volume: v 16
Issue: n 3
Issue date: Jun
Publication year: 1995
Pages: p 55
Language: Chinese, English
ISSN: 0250-3301
CODEN: HCKHDV
Document type: Journal article (JA)
Publisher: China Publ Cent, Beijing, China
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

21 Accession number: 94122453419
Title: Determination of DO in environmental water by primary-secondary wavelengths spectrophotometry
Authors: Gao, Hongwen
First author affiliation: Huaibei Environment Monitoring Cent, China
Serial title: Shiyou Huagong/Petrochemical Technology
Abbreviated serial title: Shiyou Huagong
Volume: v 23
Issue: n 8
Issue date: Aug
Publication year: 1994
Pages: p 536-543
Language: Chinese
ISSN: 1000-8144
CODEN: SHHUE8
Document type: Journal article (JA)
Publisher: Beijing Research Institute of Chemical Industry, Beijing, China

Abstract: Dissolved oxygen (DO) in water can react with manganese sulfate, potassium iodide and sulfate acid to form yellow iodine molecules. This paper studies the primary-secondary wavelengths spectrophotometric determination of trace amount of DO based on the above-mentioned reaction. It is higher in both precision and sensitivity than other methods, and the calculated curve is very stable. Suitable pretreatment can effectively eliminate the interference caused by color, turbidity and ions. Experimental results show that λp = 450nm, λs = 480nm, and within the range of 0 - 12mg/L of DO, the parameter log y is linear with log x and RSD<=5% and the recovery is between 93.6% - 107%. Minimum detection concentration of DO is 0.05mg/L. The method is suitable for natural and industrial wastes.
Abstract type: (Author abstract)
Number of references: 5
Ei main heading: Spectrophotometry
Ei controlled terms: Oxygen | Water | Manganese compounds | Potassium compounds | Sulfur compounds | Iodine | Molecules | Color
Uncontrolled terms: Primary secondary wavelength spectrophotometry | Dissolved oxygen | Environmental water | Manganese sulfate | Potassium iodide | Sulfate acid
Ei classification codes: 801.4 Physical Chemistry | 801.1 Chemistry, General | 804.2 Inorganic Compounds | 931.2 Physical Properties of Gases, Liquids & Solids
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

20 Accession number: 98074288418
Title: Study on photoabsorbance of aluminum colored solution with chrome azurol S
Authors: Gao, H.-W.; Shi, H.-L.
Serial title: Zhurnal Analiticheskoi Khimii
Abbreviated serial title: Zh Anal Khim
Volume: v 52
Issue: n 11
Publication year: 1997
Pages: p 1152-1156
Language: English
ISSN: 0044-4502
CODEN: ZAKHA8
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

19 Accession number: 98014015148
Title: Determination of copper by β-correction spectrophotometry with murexide
Authors: Zhang, Pengfei; Gao, Hongwen
First author affiliation: Huaibei Coal Teachers Coll, China
Serial title: Yejin Fenxi/Metallurgical Analysis
Abbreviated serial title: Yejin Fenxi
Volume: v 15
Issue: n 5
Issue date: Oct
Publication year: 1995
Pages: p 28-31
Language: Chinese
ISSN: 1000-7571
CODEN: YEFEET
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

18 Accession number: 02477237555
Title: Langmuir aggregation of coomassie brill blue on protein and determination of protein by MPASC
Authors: Gao, H.; Jiang, J.; Yu, L.
Serial title: Zhurnal Analiticheskoj Khimii
Abbreviated serial title: Zh Anal Khim
Volume: v 57
Issue: n 8
Publication year: 2002
Pages: p 827-834
ISSN: 0044-4502
CODEN: ZAKHA8
Document type: Journal article (JA)
Publisher: Maik Nauka
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

17 Accession number: 97073713804
Title: Updated Determination of Mercury and Its Chelate's Characteristic Parameters with o-Chlorobenzenediazoaminobenzene-p-Azobenzene by a-Correction Spectrometry
Authors: Gao, H.-W.
Serial title: Journal of Applied Spectroscopy
Abbreviated serial title: J Appl Spectrosc
Volume: v 63
Issue: n 6
Publication year: 1996
Pages: p 807
Language: English
ISSN: 0021-9037
CODEN: JASYAP
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

16 Accession number: 03227486187
Title: Investigation of property constants of both Al and Cu complexes with picramine Ca and competition coordination for selective determination of trace amounts of Cu
Authors: Gao, H.
Serial title: Zhurnal Analiticheskoj Khimii
Abbreviated serial title: Zh Anal Khim
Volume: v 58
Issue: n 4
Publication year: 2003
Pages: p 372-377
ISSN: 0044-4502
CODEN: ZAKHA8
Document type: Journal article (JA)
Publisher: Maik Nauka
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

15 Accession number: 02427143235
Title: Langmuir aggregation of phloxine on CTMAB and its application to the determination of cationic surfactants
Authors: Gao, Hong-Wen; Xu, Wen-Qing; Ye, Ming-Liang
Serial title: Lihua Jianyan: Huaxue Fence/Physical Testing and Chemical Analysis Part B:Chemical Analysis
Abbreviated serial title: Lihua Jianyan: Huaxue Fence
Volume: v 38
Issue: n 7
Issue date: July 2002
Publication year: 2002
Pages: p 325
Language: Chinese
ISSN: 1001-4020
CODEN: LJHFE2
Document type: Journal article (JA)
Publisher: Shanghai Research Institute of Materials
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

14 Accession number: 95092852048
Title: Use of β-correction spectrophotometry to improve the determination of copper solution with eriochrome black T
Authors: Gao, Hong-Wen
Serial title: Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy
Abbreviated serial title: Spectrochim Acta Part A
Volume: v 51
Issue: n 8
Issue date: Jul
Publication year: 1995
Pages: p 1379
Language: English
ISSN: 0584-8539
CODEN: SAMCAS
Document type: Journal article (JA)
Publisher: Pergamon Press Ltd, Oxford, Engl
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

13 Accession number: 93081065178
Title: Determination of trace silver by primary-secondary wavelength spectrophotometry in Ag+-PADA solution
Authors: Gao, Hongwen
First author affiliation: Huaibei Environmental Monitoring station, China
Serial title: Huagong Yejin/Engineering Chemistry & Metallurgy
Abbreviated serial title: Huagong Yejin
Volume: v 14
Issue: n 2
Issue date: May
Publication year: 1993
Pages: p 168-172
Language: Chinese
ISSN: 1001-2052
CODEN: HUYEEF
Document type: Journal article (JA)
Abstract: In basic solution Ag+ can accelerate the reaction of PADA and phenol to form a blue compound. In this paper the optical absorption behaviour of such a stable liquid suspension as the ground of the analytical method for trace silver by primary-secondary wavelengths spectrophotometry was analysed and a calculation model for Ag+ was established which is numerically stable and less sensitive to interference. By analysis of the samples of underground water and polluted water the detection limit of silver was determined to be 0.008 μg/ml, the precision <=3.3% and the recovery 94-105%. The method is proved to be suitable for the determination of Ag+ in clean water and some kinds of polluted water.
Abstract type: (Edited author abstract)
Number of references: 5
Ei main heading: Silver
Ei controlled terms: Trace analysis | Spectrophotometry | Spectrophotometers
Uncontrolled terms: Primary secondary wave length | Trace silver analysis
Ei classification codes: 547.1 Precious Metals | 941 Acoustical and Optical Measuring Instruments
Treatment: Applications (APP); Theoretical (THR); Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.

12 Accession number: 04057927774
Title: Determination of Copper in Waste Water by β -Correction New Spectrophotometry
Authors: Zhang, Pengfei; Gao, Hongwen
First author affiliation: Department of Chemistry, Huaibei Coal Teacher's College, 235000 Huaibei, China
Serial title: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Abbreviated serial title: Guang Pu Xue Yu Guang Pu Fen Xi
Volume: v 19
Issue: n 3
Publication year: 1999
Pages: p 473
Language: Chinese
ISSN: 1000-0593
CODEN: GYGFED
Document type: Journal article (JA)
Publisher: Science Press
Abstract: In pH 5-6 solution copper[Cu(II)]can react on p-dimethylaminobenzylidene rodamine (PDR) to form red compound. β -correction spectrophotometry was studied to determine trace copper. It can remove the absorption interference of surplus PDR in reation solution to raise the analytical sensitivity. Experiments for samples showed that RSD=2.9 % and the recovery rate was 87.7. %-112 %. The minimium concentration of the determination is 0.55 μg/25mL. The method is suited to analyse copper in metals and waste water.
Number of references: 5
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

11 Accession number: 04057927319
Title: Determination of 2,4-Dinitrochlorobenzene in Environmental Water by Primary-Secondary Wavelengths New Spectrophotometry
Authors: Zhang, Pengfei; Gao, Hongwen; Zhao, Jingfen
First author affiliation: Department of Chemistry, Huaibei Coal Teacher's College, 235000 Huaibei, China
Serial title: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis
Abbreviated serial title: Guang Pu Xue Yu Guang Pu Fen Xi
Volume: v 19
Issue: n 4
Publication year: 1999
Pages: p 633-634
Language: Chinese
ISSN: 1000-0593
CODEN: GYGFED
Document type: Journal article (JA)
Publisher: Science Press
Abstract: In basic solution, dinitrochlorobenzene may react on pyridine to form a purplish red compound. In this paper with the absorption property of a suspended liquid against light a new analytical method as primary-secondary wavelengths spectrophotometry was studied to determine trace dinitrochlorobenzene in environmental water. In 0-50 μg dinitrochlorobenzene/25 mL, the calculation curve is very stable and hardly affected by environment conditions. Experiments for practical waters have shown that the detection limit was 0.7 μg/25 mL dinitrochlorobenzene and RSD [less-than or equal to] 2.7% and the recovery rate was 99.2%-101.0%.
Number of references: 3
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

10 Accession number: 96110392576
Title: Updated Spectrophotometric Determination of Trace Amounts of Cadmium in Metal with o-Bromobenzenediazoaminobenzene-p-azobenzene
Authors: Zhang, P.-F.; Gao, H.-W.; Cui, G.-W.
Serial title: Canadian Journal of Applied Spectroscopy
Abbreviated serial title: Can J Appl Spectrosc
Volume: v 41
Issue: n 1
Publication year: 1996
Pages: p 1
Language: English
ISSN: 1183-7306
CODEN: CJSPEM
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

09 Accession number: 94122453419
Title: Determination of DO in environmental water by primary-secondary wavelengths spectrophotometry
Authors: Gao, Hongwen
First author affiliation: Huaibei Environment Monitoring Cent, China
Serial title: Shiyou Huagong/Petrochemical Technology
Abbreviated serial title: Shiyou Huagong
Volume: v 23
Issue: n 8
Issue date: Aug
Publication year: 1994
Pages: p 536-543
Language: Chinese
ISSN: 1000-8144
CODEN: SHHUE8
Document type: Journal article (JA)
Publisher: Beijing Research Institute of Chemical Industry, Beijing, China
Abstract: Dissolved oxygen (DO) in water can react with manganese sulfate, potassium iodide and sulfate acid to form yellow iodine molecules. This paper studies the primary-secondary wavelengths spectrophotometric determination of trace amount of DO based on the above-mentioned reaction. It is higher in both precision and sensitivity than other methods, and the calculated curve is very stable. Suitable pretreatment can effectively eliminate the interference caused by color, turbidity and ions. Experimental results show that λp = 450nm, λs = 480nm, and within the range of 0 - 12mg/L of DO, the parameter log y is linear with log x and RSD<=5% and the recovery is between 93.6% - 107%. Minimum detection concentration of DO is 0.05mg/L. The method is suitable for natural and industrial wastes.
Abstract type: (Author abstract)
Number of references: 5
Ei main heading: Spectrophotometry
Ei controlled terms: Oxygen | Water | Manganese compounds | Potassium compounds | Sulfur compounds | Iodine | Molecules | Color
Uncontrolled terms: Primary secondary wavelength spectrophotometry | Dissolved oxygen | Environmental water | Manganese sulfate | Potassium iodide | Sulfate acid
Ei classification codes: 801.4 Physical Chemistry | 801.1 Chemistry, General | 804.2 Inorganic Compounds | 931.2 Physical Properties of Gases, Liquids & Solids
Treatment: Experimental (EXP)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

08 Accession number: 97043605535
Title: a-Correction Spectrophotometry and Its Application to Determination of Trace Metals and Composition of Their Chelates Using the Example of a Calcium Complex with Chlorophosphonazo III
Authors: Gao, H.-W.
Serial title: Journal of Analytical Chemistry
Abbreviated serial title: J Anal Chem
Volume: v 52
Issue: n 2
Publication year: 1997
Pages: p 141
Language: English
ISSN: 1061-9348
CODEN: JACTE2
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

07 Accession number: 97043603359
Title: a-Correction Spectrophotometric Determination of Cadmium and Characteristic Parameters of Its Chelates Formed with 2-(2-Chlorophenylazoamino)-4-(Phenylazo)Benzene
Authors: Gao, H.-W.; Zhang, P.-F.
Serial title: Industrial Laboratory (USSR) (English translation of Zavodskaya Laboratoriya)
Abbreviated serial title: Ind Lab (USSR)
Volume: v 62
Issue: n 6
Publication year: 1996
Pages: p 335
Language: English
ISSN: 0019-8447
CODEN: INDLAP
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

06 Accession number: 97033567677
Title: Analysis of Cobalt Solution with m-Chloroazoantipyline and Determination of Trace Amounts of Cobalt by Beta-correction Spectrophotometry
Authors: Gao, H.-W.
Serial title: Canadian Journal of Applied Spectroscopy
Abbreviated serial title: Can J Appl Spectrosc
Volume: v 41
Issue: n 5
Publication year: 1996
Pages: p 113
Language: English
ISSN: 1183-7306
CODEN: CJSPEM
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

05 Accession number: 96123455280
Title: QQ -Correction Spectrophotometry and Its Application to Determination of a Trace Metal and Its Chelate Composition: Cd(II) with Dithizone
Authors: Gao, H.-W.
Serial title: Journal of Applied Spectroscopy
Abbreviated serial title: J Appl Spectrosc
Volume: v 62
Issue: n 6
Publication year: 1995
Pages: p 1047
Language: English
ISSN: 0021-9037
CODEN: JASYAP
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

04 Accession number: 96033087085
Title: Dual-wavelength spectrophotometric determinations of copper and its composition of the complex with eriochrome blue black R
Authors: Gao, H.-W.
Serial title: Recueil des Travaux Chimiques des Pays-Bas
Abbreviated serial title: Recueil Travaux Chim Pays Bas
Volume: v 114
Issue: n 2
Publication year: 1995
Pages: p 61
Language: English
CODEN: RTCPA3
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

03 Accession number: 96033062163
Title: QQ -Correction spectrophotometric determination of calcium with calcon-carboxylic acid
Authors: Gao, H.-W.
Serial title: Chemistry and Physics of Lipids
Abbreviated serial title: Chem Phys Lipids
Volume: v 75
Issue: n 2
Publication year: 1995
Pages: p 699
Language: English
ISSN: 0009-3084
CODEN: CPLIA4
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

02 Accession number: 96033059676
Title: QQ Correction Spectrophotometry: Determination of Copper with Calcium-Carboxylic Acid Indicator
Authors: Gao, H.-W.
Serial title: Canadian Journal of Applied Spectroscopy
Abbreviated serial title: Can J Appl Spectrosc
Volume: v 39
Issue: n 5
Publication year: 1994
Pages: p 132
Language: English
ISSN: 1183-7306
CODEN: CJSPEM
Document type: Journal article (JA)
Database: Compendex
Compilation and indexing terms, ? 2004 Elsevier Engineering Information, Inc.

01 Accession number: 02467209236
Title: Determination of trace amounts of cadmium with p-acetyl-benzenediazoaminoazobenzene by primary-secondary wavelength spectrophotometry
Authors: Gao, H.; Li, Yu.; Zhang, P.; Tao, M.; Wang, L.
Serial title: Zhurnal Analiticheskoj Khimii
Abbreviated serial title: Zh Anal Khim
Volume: v 56
Issue: n 11
Publication year: 2001
Pages: p 1149-1152
ISSN: 0044-4502
CODEN: ZAKHA8
Document type: Journal article (JA)
Publisher: Maik Nauka
Database: Compendex
Compilation and indexing terms, ? 2003 Elsevier Engineering Information, Inc.