拉萨河铀同位素分布特征与环境指示意义
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1.东华理工大学核资源与环境国家重点实验室;2.东华理工大学水资源与环境工程学院

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X820.4

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江西省科技厅项目


Distribution Characteristics and Environmental Significance of Uranium Isotopes in Lhasa River
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State Key Laboratory of Nuclear Resources and Environment, East China University of Technology

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    摘要:

    水体环境中铀及其同位素含量的变动对于区域生态环境的保护具有重要意义。目前,对于处于环境敏感区的拉萨河水体中铀及其同位素的研究鲜有报道。为了解拉萨河流域水体中铀及其同位素的分布特征,利用拉萨河中下游和堆龙曲支流2017年7月采集的16个采样点的水样,采用电感耦合等离子体质谱仪(ICP-MS)Element 2测量得到水样中的铀及同位素(238U、235U和234U)含量并进行分析。结果表明,拉萨河水体中铀浓度显著高于世界河流铀浓度均值,与青藏高原河水中铀浓度相当,略低于黄河干流河水中铀浓度。铀及其同位素与K+有同源性,与Mg2+及SO42-有异源性,而与其它水化学参数无显著相关关系。拉萨河水体中235U和238U具有很好的相关性,未发生显著的同位素分馏现象。拉萨河水体出现较高的(234U/238U)AR值,最主要原因是水体中234U的富集或者流失,在水-岩交换作用的影响下234U在α反冲作用下易于进入水体。羊八井附近采样点具有高铀浓度的特点,反映出其水体环境具有较好的氧化条件。

    Abstract:

    The variation of uranium and its isotopes in water environment is of great significance for the protection of regional ecological environment. At present, there are few reports on the study of uranium and its isotopes in the water body of Lhasa River, which is in an environmentally sensitive area. In order to understand the distribution characteristics of uranium and its isotopes in the water body of Lhasa River Basin, the contents of uranium and its isotopes (238U, 235U and 234U) in the water samples collected from 16 sampling points in the middle and lower reaches and Duilonqu tributary of Lhasa River and in July 2017 were measured and analyzed by inductively coupled plasma mass spectrometry (ICP-MS) element 2. The results show that the uranium concentration in the water body of Lhasa River is significantly higher than the average uranium concentration in the World Rivers, equivalent to that in the river water of Qinghai Tibet Plateau and slightly lower than that in the main stream of the Yellow River. Uranium and its isotopes have homology with K+, heterologous with Mg2+ and SO42-, but have no significant correlation with other hydro-chemical parameters. 235U and 238U in Lhasa River have good correlation, and there is no significant isotopic fractionation. The high (234U/238U)AR value in the Lhasa River is mainly due to the enrichment or loss of 234U in the water body. Under the influence of water rock exchange, 234U is easy to enter the water body under the action of α ecoil. The sampling points near Yangbajing have the characteristics of high uranium concentration, which reflects that its water environment has good oxidation conditions.

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秦欢欢,高柏,孙占学. 拉萨河铀同位素分布特征与环境指示意义[J]. 科学技术与工程, , ():

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  • 收稿日期:2021-12-24
  • 最后修改日期:2022-03-31
  • 录用日期:2022-04-30
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