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Electrocatalysis and Flow‐Injection Analysis of Hydrogen and Organic Peroxides at CuPtCl 6 Chemically Modified Electrodes
Author(s) -
Pei Jianhong,
Li Xiaoyuan
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(199911)11:16<1211::aid-elan1211>3.0.co;2-v
Subject(s) - hydrogen peroxide , detection limit , electrode , flow injection analysis , electrochemistry , chemistry , electrocatalyst , redox , cyclic voltammetry , linear range , inorganic chemistry , analytical chemistry (journal) , chromatography , organic chemistry
Cyclic voltammetry was used to investigate the electrochemical behavior of peroxides, both hydrogen and organic, on the CuPtCl 6 /GC modified electrode which displayed great electrocatalytic activity in the redox of peroxide. The results show that the electrochemical processes of peroxide on the CuPtCl 6 /GC modified electrode are controlled by the diffusion of the species, and the reduction of dissolved oxygen overlaps with the reduction of H 2 O 2 , but has no influence on the oxidation of H 2 O 2 . The modified electrode was characterized as an electrochemical sensor for the detection of peroxide, both hydrogen and organic, in a flow‐injection system. The electrode exhibited a number of great advantages such as a very wide dynamic range, quite low detection limits, high stability and short response times and simple preparation. The linear relationship between the flow‐injection peak currents and the concentrations of H 2 O 2 is in a range of 5×10 –8 to 5×10 –3 M with a detection limit of 1×10 –8 M. The linear response to tert ‐butyl hydroperoxide (TBHP) is in a range of 1×10 –5 to 2×10 –3 M with a detection limit of 5×10 –6 M.