Abstract
ABSTRACTThe high thermal stability typical of many room temperature ionic liquids (RTILs) is exploited as the basis of a method employing thermogravimetric analysis (TGA) for the determination of the solubility of various metal ion extractants in these solvents. The approach is simple, applicable to extractants lacking functional groups that would permit their ready quantification by other methods, and requires only small (mg) quantities of sample. These features of the method, along with its limitations, are illustrated by the determination of the solubility of representative examples of several common extractant families, including bis(2-ethylhexyl)phosphoric acid (HDEHP) and di-tert-butylcyclohexano-18-crown-6 (DtBuCH18C6), in a series of 1,3-dialkylimidazolium (Cnmim+)-based ionic liquids.
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