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Speciation Analysis of Chromium by Adsorptive Stripping Voltammetry in Tap and River Water Samples
Author(s) -
Grabarczyk Malgorzata
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200804313
Subject(s) - chromium , ethylenediaminetetraacetic acid , chemistry , genetic algorithm , stripping (fiber) , tap water , adsorptive stripping voltammetry , chelation , voltammetry , nuclear chemistry , metal , inorganic chemistry , electrochemistry , materials science , environmental engineering , electrode , composite material , biology , organic chemistry , evolutionary biology , engineering
An adsorptive stripping voltammetric method for speciation analysis of chromium in natural water samples has been developed. Ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) were used as complexing agents for Cr(III) present in the sample and formed as products of Cr(VI) reduction, respectively. Under optimum experimental conditions linear relations in the range from 1×10 −6 to 3×10 −5 mol L −1 without accumulation and from 1×10 −9 to 1×10 −7 at 30 s accumulation time were obtained for Cr(III) and Cr(VI), respectively. For samples in which Cr(III) concentration is higher than 1×10 −6 mol L −1 the Cr(III) and Cr(VI) were determined simultaneously in one voltammetric cell. For samples in which Cr(III) concentration is below 1×10 −6 mol L −1 only Cr(VI) was selectively determined in the presence of Cr(III), which did not influence the Cr(VI) signal. The determination of Cr(III) and Cr(VI) was successful with the application of the proposed procedure in the presence of common foreign ions. The presented method was applied for the speciation of chromium in spiked tap and river water samples with satisfactory results.