Determination of ultra-low U-236 in environment samples using ICP-MS/MS measurement and chemical separation

doi:10.1016/j.talanta.2020.121882

	Determination of ultra-low U-236 in environment samples using ICP-MS/MS measurement and chemical separation
	Wang, Yanyun 1,3; Hou, Xiaolin 1,4,5,6; Zhang, Weichao 1,2; Zhang, Luyuan 1,4,5; Fan, Yukun 1
刊名	TALANTA
	2021-03-01
卷号	224 页码:10
关键词	U-236 ICP-MS/MS Reaction gas Environmental tracer Total borate fusion
ISSN号	0039-9140
DOI	10.1016/j.talanta.2020.121882
通讯作者	Hou, Xiaolin(xiho@dtu.dk)
英文摘要	U-236 in the environment mainly originates from human nuclear activities. Based on the unique properties of uranium, U-236 can be used as a powerful tracer for investigation of oceanographic and environmental processes. This requires sensitive measuement of U-236 in various environmental samples. Due to the ultra-low radioactive level of U-236 in the environment, its measurement is only possible by mass spectrometry. Because of the low atomic ratio of 2(36)U/U-235 down to 10(-7)-10(-5) in the environment, the interferences of (UH+)-U-235-H-1 and peak tailings of U-235 and U-238 are critical challenges in the measurement of U-236 by ICP-MS. This work developed a sensitive ICP-MS/MS method for measurement of ultra-low U-236 by employing reaction cell technique and sequential quadrupole mass separators. By using 0.6 mL min(-1) CO2 - 7 mL min(-1) helium as collision/reaction gas to convert U+ and UH+ to UO+, the interferences of UH+ (UOH+/UO+ ratio) were significantly reduced to less than 2.4 x 10(-7). A minimum detectable U-236/U-238 ratio of 3.0 x 10(-1)0 was achieved, which is one order of magnitude better than reported values. By using collision focusing with helium in the reaction cell and APEX sample introduction system, the measurement sensitivity for U-236 (236UO(+)) was improved to 7.5 x 10(6) cps ppb(-1). In combination with an effective chemical separation of uranium from sample matrix and interferences using total borate fusion following extraction chromatography with UTEVA resin, a detection limit of 7.2 x 10(-1)6 g g(-1) for 236U was achieved. The developed method was verified by analysis of certified reference materials and by comparison with AMS measurement method. Soil samples collected from Northwest China were successfully analyzed. U-236/U-238 ratios down to 9 x 10(-10) were measured in these samples, and the sources of U-236 in different sits were discussed.
资助项目	National Natural Science Foundation of China[11875261] ; National Natural Science Foundation of China[91643206] ; Ministry of Science and Technology of China[2015FY110800] ; Chinese Academy of Sciences[132B61KYSB20180003] ; Chinese Academy of Sciences[XDB40000000] ; State Key Laboratory of Loess and Quaternary Geology[SKLLQG1850]
WOS关键词	ANTHROPOGENIC U-236 ; MASS-SPECTROMETRY ; SEDIMENT SAMPLES ; ISOTOPIC-RATIOS ; SOIL SAMPLES ; URANIUM ; PLUTONIUM ; U-236/U-238 ; ACTINIDES ; MS
WOS研究方向	Chemistry
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000600787800095
资助机构	National Natural Science Foundation of China ; Ministry of Science and Technology of China ; Chinese Academy of Sciences ; State Key Laboratory of Loess and Quaternary Geology
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/15802]
专题	地球环境研究所_加速器质谱中心第四纪科学与全球变化卓越创新中心
通讯作者	Hou, Xiaolin
作者单位	1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Shaanxi Key Lab Ams Technol & Applicat,Xian AMS C, Xian 710061, Peoples R China 2.Northwest Inst Nucl Technol, Xian, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Pilot Natl Lab Marine Sci & Technol Qingdao, Open Studio Ocean Continental Climate & Environm, Qingdao 266061, Peoples R China 5.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China 6.Tech Univ Denmark, Dept Environm Engn, Riso Campus,Bldg 204,Frederiksborgvej 399, DK-4000 Roskilde, Denmark
推荐引用方式 GB/T 7714	Wang, Yanyun,Hou, Xiaolin,Zhang, Weichao,et al. Determination of ultra-low U-236 in environment samples using ICP-MS/MS measurement and chemical separation[J]. TALANTA,2021,224:10.
APA	Wang, Yanyun,Hou, Xiaolin,Zhang, Weichao,Zhang, Luyuan,&Fan, Yukun.(2021).Determination of ultra-low U-236 in environment samples using ICP-MS/MS measurement and chemical separation.TALANTA,224,10.
MLA	Wang, Yanyun,et al."Determination of ultra-low U-236 in environment samples using ICP-MS/MS measurement and chemical separation".TALANTA 224(2021):10.