INVESTIGATION OF THE EXTRACTION EQUILIBRIA IN THE SYSTEM HEXACHLORIDORHENATE(IV)-NEOTETRAZOLIUM CHLORIDE-DICHLOROETHANE-WATER

摘要

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, β, 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 10~4M~(-1) cm~(-1)).