EFFECT OF THE INTERFERENCE OF ALKALI AND ALKALINE EARTH METAL IONS ON THE EXTRACTION OF90SR FROM ACIDIC NUCLEAR WASTE SOLUTIONS BY 18-CROWN-6 DERIVATIVES

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Abstract
The extraction of 90Sr from liquid sodium-bearing wastes (SBW) at the Idaho Chemical Processing Plant (ICPP) by 4’, 4’(5’)-di-(t-butyldicyclohexo)-18-crown-6 (DtBuCH18C6) and cis-dicyclohexano-l8-crown-6 (DCH18C6) in 1-octanol has been investigated. It has been shown mat the presence of group I and group II metal ions which are co-extracted by the organic solvent limits the extraction of Sr2+ from nitric acid solutions. For example, extraction experiments which were performed with 0.15 M DtBuCH18C6 in 1-octanol yielded DSr values which ranged from -20 in 3M nitric acid to -5 in a solution of 3M NaNO3 and 3M nitric acid. Furthermore, it has been shown that when the concentration of the Na+ is ≥ l.5M, an increase in the total concentration of NO3 ion has little effect on the value of Dsr The value of DSr has been studied as a function of the concentration of Li+, K+, Na+, Cs+, and Ca2+. Additionally, a comparative study of commercially available 18-crown-6 derivatives has been performed. It has been shown that although DtBuCH18C6 yields larger values of DSr in nitric acid solutions than DCH18C6, the extractants yield very similar results in SBW. This is explained by the observation mat me presence of group I and group II metal ions interferes wim the extraction of Sr2+ by DtBuCH18C6 to a greater extent than that of DCH18C6.

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