Selective voltammetric determination of chromium (VI) with DTPA and nitrate

被引：18

作者：

Korolczuk, M ^{[1
]}

Grabarczyk, M ^{[1
]}

机构：

[1] Marie Curie Sklodowska Univ, Fac Chem, PL-20031 Lublin, Poland

来源：

FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY | 1999年 / 363卷 / 04期

关键词：

D O I：

10.1007/s002160051213

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A voltammetric determination of Cr(VI) in a flow system is described based on the selective accumulation of the reduction product of Cr(VI) on an HMDE, its complexation with DTPA and subsequent reduction of the complex in presence of nitrate. The calibration graphs were linear up to 100 and 5 nmol/L for deposition times 120 and 600 s, respectively. The relative standard deviation was 2.8% (n = 5) for Cr(VI) concentrations of 5 x 10(-8) mol/L. The detection limits (3 sigma) for Cr(VI) were 1.0 and 0.12 nmol/L at deposition times of 120 and 600 s, respectively. Typical interferences derived from real water samples are discussed. The method has been applied for the determination of Cr(VI) in spiked natural water samples.

引用

页码：421 / 423

页数：3

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