Normal pulse polarographic quantification of cyanide and sulfide by the anodization of mercury |
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Authors: | Louis K Leung Duane E Bartak |
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Institution: | Department of Chemistry, University of North Dakota, Grand Forks, ND 58202 U.S.A. |
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Abstract: | Normal pulse polarography is used to quantify cyanide and sulfide simultaneously by the anodic oxidation of mercury. The detection limit for cyanide is 18 μg l-1 by the normal pulse polarographic technique. A supporting electrolyte system of 1 M Na2CO3 is optimal with regard to background interferences and sample loss. The electrode reaction for the oxidation of mercury in the presence of cyanide can be described by Hg + pCN- α Hg(CN)p2-p + 2e-, with p having values of 2, 3 and 4 depending on the surface concentration of cyanide. The feasibility of simultaneous cyanide and sulfide quantification is demonstrated with waste-water samples. |
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