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Catalytic Adsorptive Stripping Voltammetric Procedure for Determination of Total Chromium in Environmental Materials
Author(s) -
Grabarczyk Małgorzata,
Tyszczuk Katarzyna,
Korolczuk Mieczyslaw
Publication year - 2006
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.200603486
Subject(s) - chromium , adsorptive stripping voltammetry , detection limit , stripping (fiber) , chemistry , certified reference materials , adsorption , catalysis , relative standard deviation , voltammetry , analytical chemistry (journal) , nuclear chemistry , chromatography , materials science , electrochemistry , electrode , organic chemistry , composite material , biochemistry
A sensitive catalytic adsorptive stripping voltammetric procedure for determination of traces of total chromium in environmental samples is reported. The method is based on the preconcentration of a Cr(III)H 2 DTPA complex by adsorption at the HMDE from an acetate buffer solution at the potential −1.0 V vs. Ag/AgCl. Total chromium was determined as Cr(III) after reduction of Cr(VI) to Cr(III) by NaHSO 3 . In order to stabilize the signal of Cr(III) the measurements were performed at 5 °C. The calibration graph for chromium for an accumulation time of 60 s was linear in the range from 5×10 −10 to 5×10 −8 mol L −1 . The relative standard deviation for a chromium concentration of 1×10 −8 mol L −1 was 3.9% ( n =5). The detection limit for accumulation time of 60 s was about 8×10 −11 mol L −1 . The validation of the procedure was performed by the analysis of the certified reference materials.