Liquid-liquid extraction and recovery of bismuth(III) from hydrochloric acid mediausing n-octylaniline in chloroform

摘要

Liquid-liquid extraction of bismuth(III) with n-octylaniline in chloroform from hydrochloric and hydrobromic acid media was studied. Bismuth(III) was extracted quantitatively with 10 ml, 3.0% reagent in chloroform from 0.3 to 0.5 M hydrochloric acid and 0.04 to 0.1 M hydrobromic acid medium. It was stripped from organic phase with 0.01 M acetate buffer, and estimated. complexometrically. The optimum extraction conditions were evaluated by critical study of acidity, n-octylaniline concentration, equilibration time, and effect of diluents. The method is free of interferences from large number of cations and anions. The method permits sequential separation of mercury(II), bismuth(III) and zinc(II) or cadmium(II). It was successfully applied for the separation of bismuth(III) from alloy samples. The log-log plot of .distribution ratio versus n-octylaniline concentration at 0.1 and 0.2 M hydrochloric, acid concentration gave a slope value 2.2 and 1.9 respectively. The probable extracted species is (RNH_3~+)_2BiCl_5~(2-).