ANALYTICAL SEPARATION OF ANTIMONY(III) FROM BISMUTH(III), LEAD(II), GALLIUM(III), THALLIUM(III), TELLURIUM(IV) AND TIN(IV) WITH CYANEX-302

A method is proposed for the separation of antimony(III) (100-400 mu g ) from bismuth(III), lead(II), gallium(III), thallium(III), tellurium( IV) and tin(IV) from an aqueous solution of pH 0.5-1.5 using 8x10(-3)- 1 x 10(-2) mol dm(-3) cyanex 302 dissolved in toluene as an extractant . The antimony is stripped from the cyanex phase with water and determ ined spectro-photometrically with iodide. Various experimental paramet ers are optimized and the probable 1:3 stoichiometry of the extracted species is evaluated. The method is applicable to the analysis of allo ys and pharmaceutical samples. The separation and determination take o nly 20 min.