A catalytic resonance fluorometry method for determination of hydroquinone and its applications
作者：
Li, Guirong*;Tan, Guanghui;Liu, Yunfu;Wang, Yongsheng;Liao, Lifu
期刊：
Analytical Sciences,2009年25(4):493-497 ISSN：0910-6340
通讯作者：
Li, Guirong
作者机构：
[Wang, Yongsheng; Tan, Guanghui; Liu, Yunfu; Li, Guirong] Univ S China, Coll Publ Hlth, Hengyang 421001, Peoples R China.;[Liao, Lifu] Univ S China, Coll Chem & Chem Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Li, Guirong] U;Univ S China, Coll Publ Hlth, Hengyang 421001, Peoples R China.
摘要：
Pyronin Y (PY) has a strong resonance fluorescence in sulfuric acid medium. The characteristics of the resonance fluorescence spectra and the factors affecting the spectra were studied. A catalytic resonance fluorometry method for the determination of hydroquinone was proposed based on the catalytic effect of hydroquinone on the oxidation of PY by potassium bromate. The oxidation of PY resulted in the decrease of the resonance fluorescence intensity. The influences of several variables on the sensitivity were studied. At the optimized conditions, the decrease of the resonance fluorescence intensity was in proportion to the concentration of hydroquinone in the range of 4.42 - 1.60 × 103 μg l-1, and the detection limit was 1.46 μg l-1. The proposed method was applied successfully for the determination of trace hydroquinone in environment samples. The relative standard deviation was less than 3.90% and the recoveries were in the range of 95.2 - 104.0%. 2009 © The Japan Society for Analytical Chemistry.
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Determination of arsenic in hair by resonance Rayleigh scattering method with iodine green-molybdate system
作者：
Li, Guirong*;Liu, Yunfu;Wang, Yongsheng
期刊：
Analytical Letters,2009年42(1):94-107 ISSN：0003-2719
通讯作者：
Li, Guirong
作者机构：
[Wang, Yongsheng; Liu, Yunfu; Li, Guirong] Univ S China, Coll Publ Hlth, Hengyang 421001, Peoples R China.
通讯机构：
[Li, Guirong] U;Univ S China, Coll Publ Hlth, Hengyang 421001, Peoples R China.
关键词：
Arsenic;Hair samples;Iodine green;Resonance Rayleigh scattering
摘要：
A simple and fast resonance Rayleigh scattering (RRS) method for the determination of arsenic was developed. The method is based on the formation of ion-association complexes {(IG)3·[As2(Mo2O7)12]H5}m of iodine green (IG) and heteropoly acid anion [As2(Mo2O7)12]14- formed as As (V) reacts with molybdate in H2SO4 solution. The ion-association complexes can lead to distinct enhancement of RRS. The enhanced RRS intensity is proportional to the concentration of As (V) in the range of 0.008-0.40 μg ml-1. The optimum conditions, the influence factors for the reaction, and the effects of coexisting substances have been investigated. The method has high sensitivity and good selectivity; the detection limit for As (V) (3 S0/S) is 1.50 ng ml-1. The method can be applied to the determination of As (V) in hair samples. Furthermore, the mechanism of the reaction and the reasons for RRS enhancement is discussed. Copyright © Taylor & Francis Group, LLC.
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英文
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The molecular resonance fluorescence method for determination of arsenic in hair samples
作者：
Li, Guirong*;Liu, Yunfu;Wang, Yongsheng;Liao, Lifu
期刊：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY,2009年72(4):811-815 ISSN：1386-1425
通讯作者：
Li, Guirong
作者机构：
[Wang, Yongsheng; Liu, Yunfu; Li, Guirong] Univ S China, Coll Publ Hlth, Hengyang 421001, Peoples R China.;[Liao, Lifu] Univ S China, Coll Chem & Chem Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Li, Guirong] U;Univ S China, Coll Publ Hlth, Hengyang 421001, Peoples R China.
关键词：
Molecular resonance fluorescence;Arsenic;Rhodamine B;Hair samples
摘要：
A molecular resonance fluorescence quenching method for the determination of arsenic was proposed. The method is based on the quenching effect of As (V) on the molecular resonance fluorescence of Rhodamine B (RhB) in sulfuric acid medium and in the presence of molybdate and PVA. The influences of acidity, chemical and manifold variables on the sensitivity were studied. At the optimized conditions, the linear range for the determination of arsenic was 2.0 ×10<sup>-3</sup>-0.12 μg ml<sup>-1</sup> with the detection limit of 1.20 ×10<sup>-9</sup> g ml<sup>-1</sup>. The relative standard deviations for the eleven replicate determinations of 0.006 μg ml<sup>-1</sup> and 0.060 μg ml<sup>-1</sup> of arsenic were 1.12% and 1.61%, respectively. The proposed method was applied successfully for the determination of trace arsenic in hair samples with the recoveries of 94.8-104.6%. ©2008 Elsevier B.V. All rights reserved.
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