Constant current cathodic stripping potentiometric determination of arsenic on a mercury film electrode in the presence of copper ions

S. B. Adeloju, T. M. Young, D. Jagner, G. E. Batley

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39 Citations (Scopus)

Abstract

A method is described for the cathodic stripping potentiometric determination of arsenic on a mercury film electrode in 1 M HCI which contained copper (II) ions. Optimum determination of arsenic in this medium was accomplished with an electrolysis potential of -600 mV vs Ag/AgCl (1 M HCI) and application of a small constant reducing current (-1.5 μA) during the stripping step. As little as 2 μg/l of arsenic can be detected by this method in the presence of 5 mg/l copper (II) ions with an electrolysis time of 30 s. A linear concentration range of 10-200 μg/l was achieved under these conditions. Effective reduction of As(V) to As(III) in water, bovine liver and dogfish muscle samples was accomplished with L-cysteine prior to the CSP determination of arsenic.

Original languageEnglish
Pages (from-to)207-213
Number of pages7
JournalAnalytica Chimica Acta
Volume381
Issue number2-3
DOIs
Publication statusPublished - 16 Feb 1999

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