Solvent extraction separation of bismuth(III) with hexaacetato calix(6)arene

Bismuth(III) was quantitatively extracted from 0.1M HCl with 1x10(-4)M of h exaacetato calix(6)arene in toluene. It was stripped with 2 M nitric acid a nd determined from the aqueous phase spectrophotometrically at 470 nm as it s complex with thiourea. The various parameters such as pH, reagent concent ration, kind of diluents, stripping agents, effect of diverse ions were stu died to ascertain optimum conditions for the quantitative extraction of bis muth. Bismuth was separated from thorium(IV), iron(III), manganese(II), chr omium(III), lead(II), palladium(II) and thallium(III) in multicomponent mix tures. The method was extended for the analysis of bismuth in real samples.