Solvent Extraction of Dihalogenocuprate(I) with Triphenylmethane Dyes and Spectrophotometric Determination of Copper

Abstract

Malachite Green (MG), Crystal Violet (CV) and Ethyl Violet (EV). Chlorobenzene was used for the extraction of the chloro complex with MG and CV; benzene for the bromo complex with MG and CV; and toluene for the iodo complex with MG and CV, and the chloro complex with EV. Out of the extraction systems examined, the benzene-extraction of dibromocuprate(I) ion with Crystal Violet was best for the spectrophotometric determination of copper; low reagent blank, high sensitivity, stable coloration and only little interference from the coexisting ions. This method could be applied to the determination of trace amounts of copper.