Extraction of Zn^"^ by HTTA and by mixtures of (HTTA + TOPO) and (HTTA + HDNNS) from an aqueous phase of 0.1 molar ionic stoength (Na"^, CHjCGOH) was investigated at different temperatures. Extraction thermodynamic values were calculated and indicate that, the mechanism responsible for synergism in both cases is an expansion one, in which the coordination number of Zn'"*" increases from 4 to 5.
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