Direct Determination of Cyanide in Seawater

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Abstract
A rapid and precise method is presented for the direct determination of cyanide in otherwise unpolluted seawater using a cyanide ion-selective electrode. Although chloride interferes significantly at low cyanide levels its effect can be almost completely elmimiated by approproate selectivity corrections allowing determination of cyanide to less than 20 μg/1. The cyanide electrode can also be used for continuous monitoring at levels of interest in toxicological research.