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Title of Journal: Microchim Acta

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Abbravation: Microchimica Acta

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Springer-Verlag

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DOI

10.1002/ajh.24040

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1436-5073

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Adsorptive Voltammetric Study of Thorium–Alizarin

Authors: JuNan Li FenYun Yi ZhongMin Jiang JunJie Fei
Publish Date: 2003/11/10
Volume: 143, Issue: 4, Pages: 287-292
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Abstract

A new sensitive adsorptive voltammetric procedure is described for trace measurement of thorium It is based on the cathodic stripping peak of the thorium–alizarin complexon ALC complex at a carbon paste electrode CPE The complex of ThIV with alizarin is adsorbed at a CPE in a mixed buffer solution pH 50 which consists of 01 mol·L−1 sodium acetate and 004 mol·L−1 potassium biphthalate yielding a sensitive cathodic voltammetric peak corresponding to the reduction of alizarin in the complex at −057 V vs SCE The secondorder derivative peak current of the complex is linearly dependent upon the concentration of ThIV over the range of 30×10−9 ∼80×10−7 mol·L−1 The detection limit is 10×10−9 mol·L−1 for 180 s accumulation The molar ratio of each component in the complex was estimated as nThIVnALC=11 by a continuous variation method The electrode processes of the ThIV–alizarin complex at a CPE were investigated The procedure was successfully applied to the trace determination of thorium in ore and clay samples

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