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

Autor:	Daniel Jagner, S.B. Adeloju, T.M. Young, Graeme E. Batley
Rok vydání:	1999
Předmět:	Detection limit Electrolysis Chemistry Potentiometric titration Inorganic chemistry Analytical chemistry chemistry.chemical_element Biochemistry Copper Analytical Chemistry law.invention Mercury (element) Ion law Electrode Environmental Chemistry Spectroscopy Arsenic
Zdroj:	Analytica Chimica Acta. 381:207-213
ISSN:	0003-2670
DOI:	10.1016/s0003-2670(98)00700-4
Popis:	A method is described for the cathodic stripping potentiometric determination of arsenic on a mercury film electrode in 1 M HCl 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 HCl) 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dd8ba9d110a225942824bca4fb826db2 https://doi.org/10.1016/s0003-2670(98)00700-4 Zobrazit plný text záznamu Full Text from ScienceDirect