Abstract
The synergistic extraction of cobalt and cadmium (M 2+) from sulfate and perchlorate media with mixtures of 1-phenyl-3-methyl-4-stearoyl-5-hydroxypyrazole (HPMSP, PMSP − after deprotonation) and n-dodecylamine (DDA, DDAH+ after protonation) has been studied in toluene. In sulfate medium, an easy phase separation is observed. The synergistically extracted species is DDAHċM(PMSP)3, which results from the addition of the predominating DDAHċPMSP ion pair on M(PMSP)2 with logK syn=4.05 (Co) and 4.7 (Cd). In perchlorate medium, in the presence of an excess of DDAHċClO4, which is the predominating DDA species, a stable emulsion appears in the aqueous phase in contact with a clear organic phase. Due to the interfacial character of the extraction process and to aggregation phenomena, a stronger synergistic effect is achieved with Co than with Cd, leading to an increase of the Co/Cd separation coefficient. The synergistic extraction performed from perchlorate medium is slower than that from sulfate medium.
Published Version
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