Determination of uranium and thorium in geological materials using extraction chromatography

被引:41
作者
Carter, HE [1 ]
Warwick, P
Cobb, J
Longworth, G
机构
[1] Loughborough Univ Technol, Dept Chem, Environm Radiochem Res Grp, Loughborough LE11 3TU, Leics, England
[2] AEA Technol PLC, Analyt Serv Grp, Didcot OX11 0RA, Oxon, England
关键词
D O I
10.1039/a809781j
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A procedure has been developed for the determination of uranium and thorium in geological samples using extraction chromatography. Following sample preparation, uranium and thorium are pre-concentrated by precipitation with iron(III) hydroxide and then separated using UTEVA resin. The separated uranium and thorium are electrodeposited onto stainless-steel discs and then measured by alpha spectrometry. The procedure was evaluated using uraninite ore, coral and granite reference materials. The uranium and thorium concentrations and the U-234/U-238 and Th-230/U-234 activity ratio values determined for the reference materials were in good agreement with the certified values. The presence of plutonium was found to interfere with the separation, but the inclusion of a reduction step using iron(II) sulfamate eliminated the problem. Chemical recoveries for the procedure are similar to those for an anion-exchange procedure, but the extraction-chromatography procedure provides a more rapid separation using less reagents.
引用
收藏
页码:271 / 274
页数:4
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