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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
Author(s) -
Wang Chunming,
Zhu Bing,
Li Hulin
Publication year - 1999
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/(sici)1521-4109(199903)11:3<183::aid-elan183>3.0.co;2-o
Subject(s) - copper , anodic stripping voltammetry , cyclic voltammetry , chemistry , stability constants of complexes , humic acid , electrochemistry , voltammetry , electrode , stripping (fiber) , inorganic chemistry , analytical chemistry (journal) , carbon fibers , materials science , chromatography , ion , organic chemistry , composite material , fertilizer , composite number
A theory for determining the heterogeneous stability constant of a metal complex system at the surface of a chemically modified 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 4.99×10 9 .