A simple correlation has been observed between the extraction of cesium nitrate from nitric acid solution by several macrocyclic polyethers dissolved in any of a variety of oxygenated, aliphatic diluents and the concentration of water present in the organic phase. This correlation is attributed, in part, to the extraction of the hydrated nitrate anion and its solvation by the diluent, facilitated by the high concentrations of dissolved water. Cation solvation by the diluent is also shown to play an important role in determining the efficiency of extraction. As was the case for strontium extraction by dicyclohexano-18-crown-6 and its derivatives, the highest distribution ratios for cesium are typically obtained for C-5 and C-6 alcohols and ketones.
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Dietz et al. (1996) studied this question.
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