Spectrophotometric determination of rare earth elements in thorium by Xylenol Orange (in Japanese)
A spectrophotometric method for determining 20 approximates 200 ppm of rare earth elements in thorium is described. The removal of thorium is effected by thiocyanate-tributyl phosphate (THP) extraction. The concentration of ammonium thiocyanate in the sample solution is adjusted to 2M, and thorium is extracted into 15% TBP-CCl4. In order to extract thorium completely, two successive extractions are carried out by 5% TBP-CCl4. Then, rare earth elements in the aqueous phase are extracted into 50% TBP-nhexane and again back- extracted into 0.5M acetate buffer solution (pH = 6.0). The pH of the aqueous phase is adjusted to 6.0 plus or minus 0.1, and rare earth elements are determined spectrophotometrically with xylenol orange.
- Research Organization:
- Japan Atomic Energy Agency (JAEA), Tokai (Japan)
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-18-019883
- OSTI ID:
- 4015643
- Journal Information:
- Bunseki Kagaku (Japan Analyst), Vol. 13, Issue 3; Other Information: Orig. Receipt Date: 31-DEC-64; ISSN 0525-1931
- Country of Publication:
- Country unknown/Code not available
- Language:
- Japanese
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