Journal
MICROCHIMICA ACTA
Volume 169, Issue 3-4, Pages 227-231Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-010-0345-x
Keywords
Boron; Isotope dilution mass spectrometry (IDMS); Positive-thermal ionization mass spectrometry (P-TIMS); Uranium oxide; Solvent extraction
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Boron was determined at sub-ppm levels in uranium oxide by ID-TIMS. Following nitric acid dissolution, a solvent extraction method was adapted for extraction of boron by 5% 2-ethylhexane-1,3-diol in chloroform followed by evaporation of the extractant in presence of sodium carbonate and mannitol. This procedure allowed TIMS analysis of boron by monitoring the Na(2)BO (2) (+) ions formed from the sodium borate salt in the ion source. Reproducibility of about 1% was obtained for boron determination in the three different uranium oxide samples containing sub-ppm amounts of boron.
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