Normal pulse polarographic quantification of cyanide and sulfide by the anodization of mercury

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 Na 2CO 3 is optimal with regard to background interfe...

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Bibliographic Details
Published in:Analytica chimica acta 1981-11, Vol.131, p.167-174
Main Authors: Leung, Louis K., Bartak, Duane E.
Format: Article
Language:English
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Summary: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 Na 2CO 3 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) p 2-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.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(01)93547-0