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KMID : 1059519970410010026
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Journal of the Korean Chemical Society
1997 Volume.41 No. 1 p.26 ~ p.32
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Determination of Traces of meso-2,3-Dimercaptosuccinic Acid by Differential Pulse Cathodic Stripping Voltammetry
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Koo Hee-Jin
Kwon Young-Soon
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Abstract
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Cyclic voltammogram of meso-2,3-dimercaptosuccinic acid(DMSA) has two redox peaks. The potential difference between the two peaks is very small(Ep1=-0.64 V; Ep2=-0.68 V). In the absence of Cu(Ⅱ), the cathodic peak is more effective for trace analysis of DMSA, while the mono thiol compound is more effective in the presence of Cu(Ⅱ). The present study also describes the differential pulse cathodic stripping voltammetric method for the determination of DMSA. The followings were optimum condition for the study: 0.015 M borate buffer solution(pH 10.0); an accumulation potential of -0.2V(vs. Ag/AgCl); accumulation time of 120 sec; scan rate of 5 mV/sec. The detection limit of trace analysis shows 3.6 × 10-9 M of DMSA at the optimum condition.
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