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KMID : 1059519880320020130
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Journal of the Korean Chemical Society
1988 Volume.32 No. 2 p.130 ~ p.134
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Increased Sensitivity in Cyanide Measurement by Differential-Pulse Cathodic Stripping Voltammetry
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Na Moon-Son
Kwo Young-Soon
Case Myung-Zoon
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Abstract
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Direct differential-pulse cathodic stripping voltammetry on mercury electrode (HMDE) provides a sensitive technique for low level cyanide measurement in distilled and sulfide free solution. Cyclic voltammetry revealed the forming and redissolution reactions were reversible at pH 7 in 0.1M KCl-0.01M phosphate supporting electrolyte. The analytical conditions have been optimized. With deposition time of 3 min at deposition potential 0.00V(vs. Ag/AgCl) in this medium of pH 7, quite reproducible and linear calibration curve was obtained down to 3 × 10-7M (8ppb) CN- which was the detection limit.
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