Abstract
Synergism using the title metal extracting agents has been observed for bismuth. Thermodynamic parameters of the extraction process were determined by the temperature coefficient of extractability. The extraction of bismuth from HClO 4 by dinonyl naphthalene sulfonic acid (HDNNS) and the mixed ligand system are entropy controlled, whereas the process is enthalpy controlled when 2-ethylhexyl phenylphosphonic acid (HEHΦP) is the extractant. These results shed further light on the mechanism of the synergy by the combined extractants.
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