树脂分离测定盐湖水中铀的含量及^(234)U/^(238)U活度比值  

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

作　　者：李伯平[1] 刘立坤 郝伟林[1] 常阳[1] 崔建勇[1] 王志明 

机构地区：[1]核工业北京地质研究院,北京100029 [2]国家核安保技术中心,北京100037

出　　处：《核化学与放射化学》2014年第2期104-108,共5页Journal of Nuclear and Radiochemistry

摘　　要：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。A matrix pre-separation method for the determination of uranium content and 234U/238U activity ratios in saline waters by ICP-MS and a-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 sr〈10% （n=4）. The 234U/238U activity ratios were achieved by a-spectrometry after removing the interferences by P350 resin. The results show that the matrix pre-removal method can be well adapted to determine 234 U/238U activity ratios in saline waters. The sr of 3 times determination is less than 5%. The developed method has been already applied to determine the uranium content and z34 U/238U activity ratios in real saline waters.

关 键 词：盐湖水 ^234U ^238U 预分离 ICP—MS a能谱 

分 类 号：P619.14[天文地球—矿床学] O657.63[天文地球—地质学]