Abstract
A simple air gap cell is described for the determination of the free cyanide content of sample solutions. The cell contains a micro-sized silver disc working electrode. It employs amperometric detection of the cyanide at 0.0 V vs. a 0.1 M silver/silver chloride reference chloride reference electrode. The three-electrode assembly necessary for detection is located on the flat surface of a probe that is coated by a basis measuring film. The cyanide content of the sample is liberated by the addition of tartaric acid. The hydrogen cyanide gas diffusing through the air gap is accumulated in the measuring film. Owing to the working principle, cyanide concentrations as low as a few ν1 −1 can be measured. The effect of interfering species was also studied.
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