Simultaneous determination of trace-levels of alloying zinc and copper by semi-mercury-free potentiometric stripping analysis with chemometric data treatment

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Author list: Andersen JET, Hansen EH

Publisher: Springer Verlag (Germany)

Place: NEW YORK

Publication year: 1998

Journal acronym: FRESEN J ANAL CHEM

Volume number: 362

Issue number: 1

Start page: 77

End page: 83

Number of pages: 7

ISSN: 0937-0633

eISSN: 1432-1130

Languages: English-Great Britain (EN-GB)

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Abstract

Assays of copper and zinc in brass samples were performed by semi-mercury free potentiometric stripping analysis (S-MF PSA) using a thin-film mercury covered glassy-carbon working electrode and dissolved oxygen as oxidizing agent during the stripping step. The stripping peak transients were resolved by chemometrics, which enabled simultaneous determination of both the copper and the zinc concentrations, thereby eliminating the conventional necessary pretreatment of the sample solution, such as initial addition of Ga(III) or solvent extraction of copper. The brass samples were diluted by factors in the range 2 . 10(4) - 5 . 10(5) which resulted in quantification of the copper and of zinc contents comparable to the specified values within 10%. On the basis of the chemometric treatment, an empirical expression is deduced relating the stripping time to the recorded potential.

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