Add time:09/06/2019         Source:sciencedirect.com

Synergistic extraction of zinc(II) with capric acid in the presence of pyridine was carried out at 25°C and at an aqueous ionic strength of 0.1 mol dm−3 (NaClO4), the total concentration of zinc, that of capric acid and that of pyridine being less than 4 × 10−3 mol dm−3, 0.15–1.5 mol dm−3 and 1.32 × 10−2 mol dm−3 respectively. The synergistic effect is interpreted by the formation of the following mixed ligand complexes in benzene: ZnA2(HA)B and ZnA2(HA)3B. The extraction equilibria are described as follows: Zn2+ + Bw + 1.5(HA)2,o (ZnA2+(HA)B)w + 2H−

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