Determination of arsenic at a gold-plated carbon paste electrode using constant current stripping analysis

A new stripping method for the determination of arsenic in water samples with a gold film-plated carbon paste electrode has been developed for the use in constant current stripping analysis (CCSA). In the novelized procedure, differentiation between As(III) and chemically pre-reduced As(V), the effe...

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Bibliographic Details
Published in:Talanta (Oxford) 2002-08, Vol.58 (1), p.45-55
Main Authors: Švancara, Ivan, Vytřas, Karel, Bobrowski, Andrzej, Kalcher, Kurt
Format: Article
Language:English
Subjects:
Arsenic(III) and arsenic(V) determination and differentiation
Constant current stripping analysis
Gold-plated carbon paste electrode
River water
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Summary:A new stripping method for the determination of arsenic in water samples with a gold film-plated carbon paste electrode has been developed for the use in constant current stripping analysis (CCSA). In the novelized procedure, differentiation between As(III) and chemically pre-reduced As(V), the effect of Cu(II) on the response of arsenic, and the stability of sample solutions were studied in detail. Compared to the voltammetric approach, the method utilizing CCSA offers a more rapid procedure with improved analytical characteristics such as reproducibility, selectivity over the Cu(II) ions, or lower detection limit (3 ppb for As(III) and 0.5 ppb for As(V), respectively). The possibilities of the optimized method are demonstrated by determinations of As(III), As(V), and total arsenic in samples of polluted river water.
ISSN:0039-9140
1873-3573
DOI:10.1016/S0039-9140(02)00255-2