树脂分离测定盐湖水中铀的含量及~(234)U/~(238)U活度比值

研究了一种测定盐湖水中铀的含量及234 U/238 U活度比值的方法。采用Chelex-100螯合树脂将盐湖水中大量的可溶盐基体与铀分离,钠的消除率大于99.9%,铀的回收率为90.5%~106%,4次平行测定结果的相对标准偏差小于10%。经P350树脂进一步纯化后,由α能谱仪测定234 U/238 U活度比值,相对标准偏差小于5%(n=3)。研究结果表明,该基体消除法可以用于盐湖水中铀的含量及234 U/238 U活度比值的测定。该技术已被应用于实际生产中。

Determination of Uranium and 234U/238U Alpha-Activity Ratios in Saline Waters

A matrix pre-separation method for the determination of uranium content and ²³⁴U/²³⁸U activity ratios in saline waters by ICP-MS and α-spectrometry was studied. The uranium was well pre-separated from saline waters by Chelex-100 resin. The separation efficiency of Na is higher than 99.9%. The recovery of uranium is in the range of 90.5%-106% with s_r<10% (n=4). The ²³⁴U/²³⁸U activity ratios were achieved by α-spectrometry after removing the interferences by P350 resin. The results show that the matrix pre-removal method can be well adapted to determine ²³⁴U/²³⁸U activity ratios in saline waters. The s_r of 3 times determination is less than 5%. The developed method has been already applied to determine the uranium content and ²³⁴U/²³⁸U activity ratios in real saline waters.