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引用本文:   高瑞勤, 侯小琳, 张路远, 张伟超, 张梦婷. 大体积环境水样中超痕量钚同位素的分析. 分析化学, 2020, 48(6): 765-773. doi:  10.19756/j.issn.0253-3820.201093 [复制]

Citation:   GAO Rui-Qin , HOU Xiao-Lin , ZHANG Lu-Yuan , ZHANG Wei-Chao , ZHANG Meng-Ting . Determination of Ultra-Low Level Plutonium Isotopes in Large Volume Environmental Water Samples. Chinese Journal of Analytical Chemistry, 2020, 48(6): 765-773. doi: 10.19756/j.issn.0253-3820.201093 [复制]

大体积环境水样中超痕量钚同位素的分析

收稿日期: 2020-02-22

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.11875261)和中国科学院国际合作项目(No.132B61KYSB20180003)资助

Determination of Ultra-Low Level Plutonium Isotopes in Large Volume Environmental Water Samples

Received Date:  2020-02-22

Fund Project:  This work was supported by the Ministry of Science and Technology of China (No. 2015FY110800), the National Natural Science Foundation of China (No. 11875261) and the Chinese Academy of Sciences (No. 132B61KYSB20180003).

建立了一种环境水样中痕量钚同位素的分析方法。采用Ti(OH)3作为共沉淀剂,对大体积水样中的钚进行预浓缩,通过TEVA树脂萃取色谱分离纯化钚。结果表明,对于20 L水样,在钛载体浓度为30 mg/L条件下,钚的总回收率为88.9%。萃取色谱分离对铀的去污系数达到1.3×105。用高灵敏度的电感耦合等离子体串联质谱(ICP-MS/MS)同时测定239Pu和240Pu含量,使用NH3-He作为反应气体,有效消除了UH+离子对239Pu测量的干扰,通过使用串联四极杆技术,将丰度灵敏度提高5个量级,从而消除了238U峰拖尾的影响,使分析本底和干扰显著降低,同时,将钚同位素的分析灵敏度提高至990 cps/(pg/g)。对20 L水样中239Pu和240Pu的检出限分别达到1.28×10-7 Bq/L和1.38×10-7 Bq/L。本方法被成功用于分析地表水、水库水和地下水中239Pu和240Pu浓度。

关键词:   , 环境水样, 共沉淀, 氢氧化钛, 电感耦合等离子体质谱
Key words:   Plutonium, Environmental water, Coprecipitation, Titanium hydroxide, Inductively coupled plasma mass spectrometry
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大体积环境水样中超痕量钚同位素的分析

高瑞勤, 侯小琳, 张路远, 张伟超, 张梦婷

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