Abstract
A method has been developed for the direct determination of microgram amounts of sulphide by means of constant-current coulometric argentometry in ammoniacal-alkaline electrolytes. Constant-current bipotentiometric and biamperometric end-point detection techniques with two identical silver sulphide-silver microelectrodes have been used. The influence of the composition of the supporting electrolyte on the titration efficiency has also been investigated. A 100% titration efficiency is obtainable in electrolytes based upon 0.1 m sodium hydroxide at concentrations of ammonia equal to or greater than 0.1 m. This method permits the determination of 3–100 Μg of sulphide in a sample volume up to 10 ml with an error of ±1%.
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