Anodic Stripping Potentiometric Determination of Cu, Pb, Cd and Zn In Natural Waters on a Novel Combined Electrode System
作者:
S.B. Adeloju,
E. Sahara,
D. Jagner,
期刊:
Analytical Letters
(Taylor Available online 1996)
卷期:
Volume 29,
issue 2
页码: 283-302
ISSN:0003-2719
年代: 1996
DOI:10.1080/00032719608001005
出版商: Taylor & Francis Group
关键词: Anodic Stripping Potentiometry;heavy metals;natural waters;combined electrode
数据来源: Taylor
摘要:
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 HCl 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; tdep10s; 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.
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