我国东北地区土壤铀同位素水平、分布和来源

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Abstract In total 132 surface soil samples were collected from Northeast China. The ground and homogenized soil was completely dissolved using mixed acids. Uranium was separated from the sample matrix by extraction chromatography using UTEVA resin, and uranium isotopes in the separated sample were then measured by a triple quadrupole Inductively Coupled Plasma Mass Spectrometry (ICP-MS/MS) to learn the level and distribution of ²³⁸U, ²³⁵U, ²³⁴U concentrations in surface soil of the study. The ²³⁴U in surface soil of this area was reported first time, and an obvious isotope fractionation of ²³⁴U was observed in some soil samples indicated by the increased ²³⁴U/²³⁸U ratios. The distribution of ²³⁵U/²³⁸U atomic ratios in these surface soil samples showed an obvious regional deposition of uranium derived from atmospheric nuclear weapon tests the windward slope of the mountain. Consequently, the level of ²³⁵U/²³⁸U atomic ratios in the surface soil in west site of Greater Khingan Mountain were higher than other places. The level of uranium isotopes in surface soil was comparable to the environmental background level in other places, indicating negligible impacts from human nuclear activities. The source analysis showed that uranium isotopes in surface soil were dominated by rock weathering, human industrial and agricultural activities also contributed moderately in some areas.

Key words： Uranium ICP-MS/MS environmental radioactivity soil isotope disequilibrium ²³⁵U/²³⁸U ²³⁴U/²³⁸U

Received: 28 October 2020

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	HUANG Zhao
	HOU Xiao-lin
	ZHAO Xue
	ZHANG Lu-yuan

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HUANG Zhao,HOU Xiao-lin,ZHAO Xue等. Uranium isotopes in surface soil in Inner Mongolia and northwest China: level, distribution and sources[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2343-2351.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I5/2343

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