‎17th Iranian Seminar of Analytical Chemistry , 2010-09-12

Title : ( Development of vapor generation–spectrophotometric detection system for selective determination of trace ‎amount of sulfide in water )

Authors: Mohammad Hossein Arbab Zavar , Mostafa Aliakbari , M. Barghamadi‎ , M. Omidvar-Motlagh ,

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Abstract

A continuous flow vapor generation system for the determination of sulfide at low levels in aqueous samples ‎based on hydrogen sulfide prevaporation and spectrophotometric detection has been developed. In a ‎modified commercial vapor generator, the analyte was converted into hydrogen sulfide by reaction with ‎hydrochloric acid, separated in a gas liquid separator and accepted into a dilute alkaline solution, thus, ‎interferences could be avoided. Subsequently, the solution acidified and merged with N,N-dimethyl-p-‎phenylenediamine (DMPD) and Fe (III) to produce methylene blue dye. The absorbance was measured at 668 ‎nm after 10 min. The effects of parameters on the detection system such as concentrations of acid, DMPD, and Fe ‎‎(III) were studied. The influences of experimental operating parameters including concentration of ‎hydrochloric acid, volume and concentration of trapping solution, flow rates of solutions and Ar carrier gas, ‎magnet stirring rate in trap vial and generation time were evaluated and optimum conditions were obtained. ‎Under the operating conditions, the proposed method provides a linear working range of 2-100 ng mL-1 sulfide ‎with a relative standard deviation of 3.8% (RSD, n = 7) at 50 ng mL-1 S2- and a detection limit (3a, n = 7) of 1.7 ng ‎mL-1 S2-. The proposed technique for separation, preconcentration and detection was applied satisfactorily to ‎sulfide determination in spiked contaminated tap water.‎

Keywords

, Sulfide, ‎ Vapor generation, Spectropholometry
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@inproceedings{paperid:1017817,
author = {Arbab Zavar, Mohammad Hossein and Aliakbari, Mostafa and M. Barghamadi‎ and M. Omidvar-Motlagh},
title = {Development of vapor generation–spectrophotometric detection system for selective determination of trace ‎amount of sulfide in water},
booktitle = {‎17th Iranian Seminar of Analytical Chemistry},
year = {2010},
location = {کاشان, IRAN},
keywords = {Sulfide;‎ Vapor generation; Spectropholometry},
}

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%0 Conference Proceedings
%T Development of vapor generation–spectrophotometric detection system for selective determination of trace ‎amount of sulfide in water
%A Arbab Zavar, Mohammad Hossein
%A Aliakbari, Mostafa
%A M. Barghamadi‎
%A M. Omidvar-Motlagh
%J ‎17th Iranian Seminar of Analytical Chemistry
%D 2010

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