Organophosphorus reagents as extractants: Part I-Liquid-liquid extraction of silver(I) and its separation from binary mixtures using triphenylphosphine oxide in chloroform

Abstract

Silver(I) has been extracted from aqueous phase into chloroform by triphenylphosphine oxide (Ph₃PO) at <em>p</em>H 6 using Britton-Robinson buffer (CH₃COOH-NaOH). The separation of silver(I) has been carried out from binary mixtures :(a) Ag(I)-M(Il)(M = Mn, Co, Ni, CU, Zn, Cd, Sn, Pb or Mg) and (b) Ag(I)-M(III) (M = AI, Cr, Fe). The extracted species are identified as Ag(Ph₃PO)₃ (NO₃) and Ag(Ph₃PO)₃ (NO₃) in the concentration ranges of 0.01- 0.04<em>M</em> and 0.045-0.09<em>M, </em>respectively. The effects of different anions (i.e. NO, CH₃COO^- , SOand Cl^-), <em>p</em>H of the solution and dilution of the two phases have been also studied.