セロソルブによるカルシウムとストロンチウムの分離
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A method for separation of strontium from a large quantity of calcium based on the difference in solubilities of salts in hot cellosolves {ethylene glycol monoalkyl (or monoaryl) ethers} was investigated. It was shown that the use of butyl cellosolve was the most favorable among five cellosolves examined (methyl, ethyl, propyl, butyl and phenyl).<BR>Solubility of Sr(NO<SUB>3</SUB>)<SUB>2</SUB> in dry cellosolves is very small whereas Ca(NO<SUB>3</SUB>)<SUB>2</SUB>is dissolved easily. Ratio of the solubilities is of the order of 10<SUP>3</SUP>. When a trace amount of water is present in cellosolves, solubility of both calcium and strontium nitrates becomes larger.<BR>Two alternative procedures for separation were presented. An adequate volume of dry butyl cellosolve is added to the dried solid mixture of Ca(NO<SUB>3</SUB>)<SUB>2</SUB> and Sr(NO<SUB>3</SUB>)<SUB>2</SUB>, and Ca(NO<SUB>3</SUB>)<SUB>2</SUB> is dissolved by boiling the solution. Calcium in the solution is filtered off while hot. A more desirable procedure is that Sr(NO<SUB>3</SUB>)<SUB>2</SUB> is precipitated from the cellosolve solution containing a small amount of water by boiling for a few minutes. Dehydration of the solution can thus be accomplishedeasily and completely by this procedure, and Sr(NO <SUB>3</SUB>)<SUB>2</SUB> is precipitated out.<BR>The method is not so laborious and does not require special techniques as in the fuming nitric acid method for separating strontium fromcalcium. The cellosolves can be easily dried by boiling alone and determination of purity of Srfraction can be done without difficulty in the course of analytical process.
- 社団法人 日本分析化学会の論文
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