title: Investigation of the extraction equilibria in the system hexachloridorhenate(IV)-neotetrazolium chloride-dichloroethane-water.
abstract: The neotetrazolium hexachloridorhenate(IV) (NTReCl(6)) has been synthesized and its composition checked. The optimum conditions for the extraction of NTReCl(6) with dichloroethane have been established. The recovery factor for one-fold extraction is R = 74%. The distribution constant, K(D), extraction constant, K(ex), and ion-association constant, beta, have been determined. Neotetrazolium chloride was found to be suitable reagent for extraction-spectrophotometric determination of rhenium(IV) ((NTReCl(6)) = 3.42 +/- 0.20 x 10(4)M(-1) cm(-1)).
authors.affiliation: Department of General and Inorganic Chemistry, Plovdiv University, Plovdiv, Bulgaria.
authors.forename: Z
authors.initials: Z
authors.lastname: Simeonova
authors.forename: A
authors.initials: A
authors.lastname: Alexandrov
authors.forename: S
authors.initials: S
authors.lastname: Dicheva