Spectrophotometric determination of rare earth elements in thorium by Xylenol Orange

Journal Article · Tue Dec 31 23:00:00 EST 1963 · Bunseki Kagaku (Japan Analyst)

DOI:https://doi.org/10.2116/bunsekikagaku.13.203· OSTI ID:4015643

YOSHIDA, Hiroyuki

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 Research Inst., Tokyo
• Sponsoring Organization: USDOE
• NSA Number: NSA-18-019883
• OSTI ID: 4015643
• Journal Information: Bunseki Kagaku (Japan Analyst), Journal Name: Bunseki Kagaku (Japan Analyst) Journal Issue: 3 Vol. 13; ISSN 0525-1931
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

ACIDITY
BUTYL PHOSPHATES
CARBON TETRACHLORIDE
CHEMISTRY
CYANIDES
HEXANE
ORGANIC SULFUR COMPOUNDS
PHOTOMETRY
QUANTITATIVE ANALYSIS
RARE EARTHS
SOLUTIONS
SOLVENT EXTRACTION
SPECTROSCOPY
THORIUM
THORIUM COMPLEXES
WATER
XYLENOL ORANGE