抄録
The extraction of some metal ions with the sodium salt of di-2-ethylhexylphosphoric acid (D2EHPA) is investigated in order to clarify the extraction characteristics and mechanism. The sodium salt of D2EHPA extracts metal ions primarily by the exchange reaction of sodium ion to the metal ion and the extractability depends on the initial concentration of the extractant and metal ions or these factors and the initial pH . The conversion of D2EHPA into the salt form enables one to obtain the high and constant extractability from an acidic solution regardless of the initial pH over a wide pH range.
