Summary
The solvent extraction of Ni(II) and Co(II) from perchlorate media by chlorendic acid into MIBK has been studied as a function of pH and ligand concentration. In the pH range 3–6, both metals have a maximum extraction efficiency of only 30%. Beyond pH 4.5, the plot of logD vs. pH shows a negative slope. This decline in extraction efficiency occurs in the same pH region in which there is a transition of the predominating complexing species from HL−1 to L−2. Considering this observation, the presence of L−2 does not lead to the formation of any considerable amount of extractable species. Most likely, these substances are remaining in the aqueous phase as anionic complexes.
Zusammenfassung
Die Extraktion von Ni(II) und Co(II) aus perchlorathaltigem Medium mit Hilfe von Chlorendic-Säure (Hexachlor-norbornyl-1,2-dicarbonsäure) in Methylisobutylketon in ihrer Abhängigkeit von pH und Ligand-Kon-zentration wurde untersucht. Zwischen pH 3 und 6 werden die beiden Metalle maximal nur bis zu 30% extrahiert. Jenseits von pH 4,5 zeigt die Abhängigkeit von log D gegen pH ein negatives Gefälle. Diese Abnahme der Extrahierbarkeit tritt im gleichen pH-Bereich auf, wie der Übergang der vorherrschenden komplexbildenden Form HL1− in L2−. Die Anwesenheit von L2− führt nicht zur Bildung wesentlicher Mengen extrahierbarer Substanz. Diese verbleibt in der wäßrigen Phase in Form anionischer Komplexe.
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Berger, S.A. The liquid-liquid extraction of nickel(ii) and cobalt(ii) with chlorendic acid. Mikrochim Acta 78, 125–132 (1982). https://doi.org/10.1007/BF01206698
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DOI: https://doi.org/10.1007/BF01206698