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The equilibria and speciation in the solvent extraction of LiCl by nonamethyl-14-crown-4 ether in 1-octanol have been determined by use of ion chromatography (IC) and inductively coupled plasma (ICP) analyses, equilibrium modeling with the program SXLSQI, and 7 Li NMR measurements. SXLSQI modeling of the extraction data indicates the formation of a 1:1 metal:crown complex in the organic phase. The complex apparently exists as an ion-pair, which partially dissociates to the complex cation and free chloride anion . Extraction of LiCl by 1-octanol to give the organic-phase ion-pair and its dissociated ions and must be included in the data analysis. 7 Li NMR measurements verify the existence of free and crown-complexed lithium species in 1-octanol, and the measurements quantitatively agree with results from the SXLSQI model.
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Sun et al. (1996) studied this question.
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