EXTRACTION OF STOONTIUM FROM NITRIC ACID SOLUTIONS USING DICYCLOHEXANO-18-CROWN-5 AND ITS DERIVATIVES*
作者:
E. P. Horwitz,
M. L. Dietz,
D. E. Fisher,
期刊:
Solvent Extraction and Ion Exchange
(Taylor Available online 1990)
卷期:
Volume 8,
issue 4-5
页码: 557-572
ISSN:0736-6299
年代: 1990
DOI:10.1080/07366299008918017
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Dicyclohexano-18-Crown-6 (DCH18C6)and its dimethyl and di-t-butyl derivatives have been evaluated as extractants for Sr (II) from nitric acid media. As with DCH18C6, a correlation is observed between the extraction of strontium nitrate by the di-t-butyl compound dissolved in a variety of oxygenated, aliphatic solvents and the concentration of water in the organic phase. Comparison of the extractant dependencies of the three compounds using n-octanol as the diluent shows that the expected first power dependence of the strontium distribution ratio (Dsr) on crown concentration is observed only for the di-t-butyl derivative. DCH18C6 shows a marked deviation from first power dependence at crown concentrations greater -0.01 M. Dsr acid dependencies for DCHl8C6 and the di-t-butyl derivative do not exhibit the decrease in strontium distribution ratios at high acidities observed for DCH18C6 in chlorinated hydrocarbons.
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