EXTRACTION AND SEPARATION STUDIES OF PLATINUM(IV) WITH N-N-OCTYLANILINE

N-n-octylaniline in xylene is used for the extractive separation of pl atinum(IV) from acidic media. Platinum(IV) was extracted quantitativel y with 10 mi of 3% reagent in xylene from 0.5 to 10 and 2.5 to 10 M hy drochloric and sulphuric acid, respectively. It was stripped from orga nic phase with water and estimated photometrically with stannous chlor ide. The effect of metal ion, acids, reagent concentration and of vari ous foreign ions has been investigated. The method affords binary sepa ration of platinum(IV) from iron(III), cobalt(II), nickel(II) and copp er(II), and is applicable to the analysis of synthetic mixtures and al loys. The method is fast, accurate and precise. (C) 1998 Elsevier Scie nce B.V. All rights reserved.