分析化学2018，Vol.46Issue(7)：1137-1144,8.DOI:10.11895/j.issn.0253-3820.181098
植物样品中低水平铀同位素分析
Determination of Low Level Uranium Isotopes in Vegetation Samples
摘要
Abstract
An analytical method was developed for determination of low-level uranium isotopes in vegetation samples. Dry ashing method was employed to decompose organic matters of vegetation. The sample ash was further digested using multiple acids. Uranium in the prepared sample solution was separated and purified by an extraction chromatography using UTEVA resin. The chemical recovery of uranium in the separation procedure was more than 94% , and more than 99% of Na, K, Ca and other matrix elements and interfering elements were removed. Three natural uranium isotopes were finally measured with high sensitivity ICP-MS/MS. The detection limits of the method for 238U, 235U, 234U were 3. 05, 0. 34 and 0. 04 pg/g, respectively. The detection limits for 238U and 235U were 10 times better than the reported values. Analysis result of U in GBW-10046 standard reference material was in good agreement with reference value, indicating that this method was reliable. The method was successfully applied to determination of uranium isotopes in the vegetation samples collected in Xi′an region, and it was found that the uranium concentrations and isotopic ratios in these vegetation samples fall well into natural level, and there was no significant artificial uranium contamination. This was the first survey of the three natural uranium isotopes in vegetation samples in this region.关键词
铀/同位素比值/植物样品/固相萃取/电感耦合等离子体串联质谱Key words
Uranium/Isotope ratio/Vegetation samples/Solid phase extraction/Inductively coupled plasma tandem mass spectrometry引用本文复制引用
鲁彤,侯小琳,张路远,陈宁,张伟超,王妍芸..植物样品中低水平铀同位素分析[J].分析化学,2018,46(7):1137-1144,8.基金项目
本文系科技部基础性工作专项项目(No. 2015FY110800)、国家自然科学基金项目(No. 11605207)和黄土与第四纪国家重点实验室培育项目资助 This work was supported by the Ministry of Science and Technology of China (No. 2015FY110800), the National Natural Science Foundation of China (No. 11605207) and the State Key Laboratory of Loess and Quaternary Geology. （No. 2015FY110800）
