Simultaneous determination of chromium(VI) and chromium(III) at trace levels by adsorptive stripping voltammetry

被引：79

作者：

Domínguez, O ^{[1
]}

Arcos, MJ ^{[1
]}

机构：

[1] Univ Burgos, Fac Ciencias, Dept Quim, Area Quim Analit, E-09001 Burgos, Spain

来源：

ANALYTICA CHIMICA ACTA | 2002年 / 470卷 / 02期

关键词：

speciation; chromium; stripping voltammetry; multivariate calibration; genetic algorithm;

D O I：

10.1016/S0003-2670(02)00757-2

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new methodology was proposed for the speciation of chromium by differential pulse adsorptive stripping voltammetry (DPAdSV) using pyrocatechol violet (PCV) and N-(2-hydroxyethyl)ethylenediamine-N,N',N'-triacetic acid (HEDTA) as complexing agents. In this procedure, a partial least squares (PLS) regression was used for the resolution of the strongly overlapping voltammetric signals from mixtures of Cr(III) and Cr(VI) in the presence of PCV and HEDTA. The relative error in absolute value was <6% when concentrations of several mixtures were calculated. The analysis of the possible effect of the presence of foreign ions in the solution was performed. The procedure was successfully applied to the speciation of chromium in different samples of natural water. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：241 / 252

页数：12

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