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Theoretical Analysis and Determination of the Heterogeneous Stability Constant of Copper(II)-Humic Acids Complex at Chemically Modified Carbon Paste Electrode

✍ Scribed by Chunming Wang; Bing Zhu; Hulin Li


Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
165 KB
Volume
11
Category
Article
ISSN
1040-0397

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✦ Synopsis


A theory for determining the heterogeneous stability constant of a metal complex system at the surface of a chemically modi®ed carbon paste electrode was developed. The proposed theory has been applied to the studies of a copper(II)-humic acids (Has) complex system. In an open circuit, copper(II) was accumulated from a stirred preconcentration medium onto the HAs-CMCPE. The subsequent electrochemical measurement was performed in a small volume of Britton-Robinson (B-R) buffer (pH 3.78). By means of cyclic voltammetry (CV) and anodic stripping voltammetry (ASV), the determined average heterogeneous stability constant of copper(II)-HAs complex was 4.99610 9 .