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APPLICATION OF THE SOLVENT EXTRACTION SEPARATION METHOD WITH ACETYL ACETONE TO THORIUM ANALYSIS (in Japanese)

Journal Article · · Bunseki Kagaku (Japan)
The applications of the previously reported solvent extraction separation method in the system of acetyl acetone complexes-carbon tetrachloride to thorium-related samples were investigated. Sulfuric acid for Korean monazites, sodium peroxide tusion for Malayan xenotimes, and hydrochloric acid for thorium phosphntes are conveniently preferred for the sample opening, respectively. Hydrofluoric acid as a group separating agent of thorium and rare earths has a great advantage over oxalic acid because of its little solubility losses and the direct dissolution of some insoluble hydrolysis precipitates. The hardness of filtering of the gelatinous fluoride precipitates, which is one of the difficulties in the procedure, can be avoided by evaporating the precipitates to dryness on a steam bath. Oxalic acid as a precipitant should be used separately for thorium and rare earths. The combined method of some modified group separation with hydrofluoric acid and the proposed solvent extraction separation is recognized to be effective, by which thorium, cerium, and the total rare earths were determined in Korean monazite with coefficients of variation of, respectively, 1.7, 0.2, and 0.3%. In addition, the potentiometry with potassium ferrocyaaide for cerium analysis is also found to be suitable. (auth)
Research Organization:
Mitsui Mining and Smelting Co., Ltd., Tokyo
Sponsoring Organization:
USDOE
NSA Number:
NSA-18-019885
OSTI ID:
4032062
Journal Information:
Bunseki Kagaku (Japan), Journal Name: Bunseki Kagaku (Japan) Vol. Vol: 13; ISSN BNSKA
Country of Publication:
Country unknown/Code not available
Language:
Japanese