title: Heterocyclic dithiophosphates as analytical reagents Indirect extraction-spectrophotometric determination of silver in copper concentrates and ores.
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 mug of silver in 5 ml of toluene extract and 5-30 mug in 10 ml of toluene extract. The method is applied to the determination of silver in copper concentrates and ores.
authors.affiliation: Plovdiv University "Paissii Hilendarski", Department of Analytical Chemistry, 4000 Plovdiv, Bulgaria.
authors.forename: D
authors.initials: D
authors.lastname: Atanassova
authors.forename: A N
authors.initials: AN
authors.lastname: Shishkov