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Voltammetric Determination of Thiourea at Conductive Diamond Electrodes
Author(s) -
Spataru Nicolae,
Spataru Tanta,
Fujishima Akira
Publication year - 2005
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/elan.200403139
Subject(s) - thiourea , electrode , platinum , glassy carbon , cyclic voltammetry , chemistry , inorganic chemistry , diamond , voltammetry , electrochemistry , electron transfer , adsorption , carbon fibers , analytical chemistry (journal) , materials science , photochemistry , chromatography , organic chemistry , catalysis , composite material , composite number
The oxidation of thiourea (TU) at boron‐doped diamond (BDD) electrodes was investigated by the use of anodic voltammetry. The results indicated that the overall TU oxidation reaction is rather complicated and takes place via two steps: a slow electron‐transfer yielding the corresponding free radical, followed by a fast oxidation of this radical, prior to its dimerization. It was found that in acidic media the voltammetric response is suitable for analytical applications, and unlike glassy carbon (GC), BDD electrodes exhibit very low susceptibility to adsorption. The same conclusion was supported by the results of AC voltammetric measurements. Based upon the voltammetric peak for the first step of TU oxidation, a method is proposed for the determination of this compound in the micromolar concentration range. The analytical performance characteristics of the method are comparable to those reported for TU determination by the use of platinum electrodes or enzyme‐modified platinum electrodes.