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Determination of Cr(VI) by Catalytic Adsorptive Stripping Voltammetry with Application of Nitrilotriacetic Acid as a Masking Agent
Author(s) -
Grabarczyk Malgorzata,
Kaczmarek Lukasz,
Korolczuk Mieczyslaw
Publication year - 2004
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.200402977
Subject(s) - nitrilotriacetic acid , adsorptive stripping voltammetry , detection limit , stripping (fiber) , masking agent , chemistry , catalysis , calibration curve , voltammetry , differential pulse voltammetry , electrochemistry , analytical chemistry (journal) , nuclear chemistry , inorganic chemistry , chromatography , cyclic voltammetry , materials science , electrode , chelation , biochemistry , composite material
A selective and sensitive method for determination of traces of Cr(VI) in the presence of a large excess of Cr(III) by differential pulse catalytic adsorptive stripping voltammetry is presented. For minimization of Cr(III) interference nitrilotriacetic acid was used as a masking agent. The determinations were performed in a flow system. The calibration plot was linear from 1×10 −10 to 1×10 −8 mol L −1 for accumulation time 60 s. The relative standard deviation for 3×10 −9 mol L −1 Cr(VI) was 4.1% ( n =5). The detection limit for an accumulation time of 60 s was 4×10 −11 mol L −1 . The influence of common foreign ions is also presented. The performance of the method was verified by analysis of certified reference material for Cr(VI) and comparing the results of analyses of natural water samples with those obtained by another accepted electrochemical method.