用内标技术测量环境样品中的铀

Analysis of Uranium in Environmental Sample by Internal Standard Method

摘要: 用MAT 262热表面电离型同位素质谱计测定了铀的同位素丰度比。环境样品采用HNO3 HF HClO4混合溶液溶解后,用TBP色层法进行分离纯化,再经电镀制备成供质谱用的测量源。结果表明,所测环境样品中铀的质量分数为:河水,8×10-8;长青树树叶,1×10-7;表层土壤,(5～11)×10-6。

Abstract: Uranium isotope abundance ratios in the uranium samples are detected by MAT-262 thermol ionization mass spectrometry. Before mass spectrometry analysis, samples are dissolved in a concentrated acidic solution containing HNO_3, HF and HClO_4, and chemically processed by use of TBP chromatography and electroplate to suit the analysis requirement. Analysis results indicate that the (uranium) contents are 8×10~(-8) in the river water, 1×10~(-7) in the evergreen leaf, and (5～11)×10~(-6) in the surface soil, respectively.