Abstract
AbstractThe distribution equilibria of Pd(II) between aqueous bromide media and Cyanex‐923 as well as Cyanex‐ 471X in toluene was studied as a function of the concentration of extractants and the acid concentration. The extraction behaviour of Cyanex‐471X is compared with Cyanex‐923 as they contain different donor atoms. The quantitative extraction of Pd(II) was observed with Cyanex‐923 in toluene from 4.0–8.0 mol l−1 HBr media and was stripped out with 2.0 mol l−1 hydrochloric acid. Similarly Pd(II) was quantitatively extracted with Cyanex‐471X in toluene from 6.0–8.0 mol l−1 HBr media and was stripped out with 7.0 mol l−1 NH3 solution as well as 1.0 mol l−1 of stabilized sodium thiosulfate solution at pH 4.4. The stoichiometry of the Cyanex‐923 and Cyanex‐471X extracted species determined from slope analysis was 1:2 and 1:1, respectively. Palladium(II) was extracted and separated from its binary and ternary mixture.These methods were successfully employed for analysis of palladium in real samples.
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