Anodic stripping potentiometric determination of Cu, Pb, Cd and Zn in natural waters on a novel combined electrode system

S. B. Adeloju, E. Sahara, D. Jagner

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A method is described for the reliable determination of copper, lead, cadmium and zinc in natural waters by anodic stripping potentiometry with the use of a novel combined electrode. The method involves two stripping cycles during which copper is initially determined on its own, followed by simultaneous determination of lead, cadmium and zinc after addition of gallium (III) ions. The optimum conditions include 0.01 M HCI as supporting electrolyte, 10 mg/L Hg (II) as chemical oxidant; Edep(Cu) -700 mV vs Ag/AgCl; Edep(Pb,cd,zn) -1200 mV vs Ag/AgCl; tdep 10s; 150 μg/L Ga (III); sample rotation rate 5 and rest period 30s. Under these conditions, as low as 0.06 μg/L Cu ( 0,7% RSD ); 0.2 μg/L Pb ( 13% RSD ); 0.04 μg/L Cd ( 7.8% RSD ) and 0.06 μg/L Zn ( 5.5% RSD ) can be determined reliably. A linear concentration range of 0 - 110 μg/L was obtained for the four metals The successful application of the method to reference fresh water, creek water and tap water is demonstrated.

Original languageEnglish
Pages (from-to)283-302
Number of pages20
JournalAnalytical Letters
Volume29
Issue number2
DOIs
Publication statusPublished - 01 Jan 1996

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