Title: Description of liquid—liquid extraction equilibria in exchange extractions of chelates
Abstract: Equilibrium values of free ligand concentration (pA) in extraction systems which contain comparable amounts of metal and extraction agents, particularly exchange extraction systems, can readily be calculated with a desk computer. The technique is applied in the treatment of extraction systems where step-wise complexation, hydrolysis, masking and polynuclear complex formation of the metal take place in the aqueous phase. Data of normalized coordinates are tabulated and proved to be useful in finding pA in extraction systems of chelates MA .... MA4, of various compositions. The same mathematical approach is used to calculate enrichment factors for two-element separations as a function of pA and pH. Model systems of the Zn, Pb, Co(II), Co(III) and Fe(II) diethyldithiocarbamates and Fe(III) and Sc 8-quinolinolates serve as examples.
Publication Year: 1981
Publication Date: 1981-12-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 2
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