Spectrophotometric determination of trace amounts of copper after pre-concentration with thiuram disulphide
Abstract
Copper can be determined spectrophotometrically as the complex copper(II) bis(pentamethylene dithiocarbamate) after pre-concentration by coprecipitation of the complex with thiuram disulphide. The statistical importance on copper recovery with preconcentration of pH, the amount of thiuram disulphide, the solution standing time with the precipitate and the solution temperature are tested by the method of full factorial experiments of the 2n type. The influence of Ni2+, Co2+, Fe2+/3+ and Mn2+ is removed by masking with EDTA at pH 5–8. The copper detection limit is approximately 3 µg dm–3 for water samples and 0.03 µg g–1 for solid samples.