Determination of low levels of cyanide with a silver/silver sulphide wire electrode
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A silver/silver sulphide electrode is prepred quickly by holding a cleaned silver wire in vapours from molten sulphur. In 1000-10 mg l-1 cyanide solutions, the electrode exhibits a linear E/log CCN function which becomes slightly sinusoidal for 10-0.1 mg l-1 cyanide. The average slope is slightl super-Nerstian (10 mV/decade concentration). The applicability of the electrode is demonstrated for the determinations of microgram quantities of water-soluble cyanide from the Prussian blue pigments which are constituents of externally applied cosmetics. The home-made electrode provides results agreing with those obtained with commercially available electrodes.
Keywords:silver electrode / silver sulphide electrode / determinations of water-soluble cyanide
Source:Analytica Chimica Acta, 1987, 196, C, 221-227