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.
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