Abstract
Synergistic extraction of trivalent lanthanides and actinides, alkaline earths and thorium from hydrochloric solutions was studied, using a combination of a monoacidic phosphate or phosphonate ester (the chelating agent) with a neutral organophosphorus compound (the synergist) at varying concentrations in cyclohexane. Of the above, only lanthanides with Z>64 and Ba failed to show any synergistic phenomena. In general, the synergism was much less pronounced than in the case of U(VI). The basic difference between synergism for U(VI) and for other ions is pointed out, formulae are proposed for the extracted species and the values of some equilibrium constants are derived.
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