Abstract
The proposed method is based on the exchange reaction between the complex of copper(II) with 4,7-dimethyl-2-thiol-2-thion-1,3,2-dioxophosphorinan (DOPh III) in toluene and an aqueous solution of silver(I). The decrease in the absorbance of the Cu(DOPh III) 2 solution is proportional to the silver(I) concentration for 5–90 μg of silver in 5 ml of toluene extract and 5–30 μg in 10 ml of toluene extract. The method is applied to the determination of silver in copper concentrates and ores.
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