Speciation of Cr(III) and Cr(VI) in environmental samples by using coprecipitation with praseodymium(III) hydroxide and determination by flame atomic absorption spectrometry

被引:0
作者
Mustafa Soylak
Ayse Aydin
机构
[1] Erciyes University,Chemistry Department, Faculty of Science
[2] King Saud University,Department of Chemistry, College of Science
来源
Journal of the Iranian Chemical Society | 2012年 / 9卷
关键词
Speciation; Chromium; Atomic absorption spectrometry;
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暂无
中图分类号
学科分类号
摘要
A speciation procedure has been established for the flame atomic absorption spectrometric determination of Cr(III) and Cr(VI) based on coprecipitation of Cr(III) by using praseodymium(III) hydroxide (Pr(OH)3) precipitate. In the presented system, Cr(III) was quantitatively (>95%) recovered at the pH range of 10.0–12.0 on Pr(III) hydroxide, while the recoveries of Cr(VI) were below 10%. The method was applied to the determination of the total chromium after reduction of Cr(VI) to Cr(III) by using hydroxylamine hydrochloride. The concentration of Cr(VI) is calculated by difference of total chromium and Cr(III) levels. The analytical parameters including pH of the aqueous medium, amount of Pr(III), centrifugation speed, sample volume were optimized. The influences of matrix ions were also investigated. The method was validated by the analysis of TMDA 70 fortified lake water certified reference material. The method was applied to the speciation of chromium in water samples.
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页码:263 / 267
页数:4
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