同位素2026，Vol.39Issue(2)：97-106,10.DOI:10.7538/tws.2025.youxian.083
基于铀同位素分馏(δ238U)测量的地浸采铀地下水修复还原度评估方法
A Method of Estimating Uranium Reduction Degree for In situ Leaching Uranium Mine Restoration
高洁 1江国平 2徐乐昌 1胡鹏华 1周磊1
作者信息
- 1. 核工业北京化工冶金研究院,北京 101149
- 2. 核工业北京化工冶金研究院,北京 101149||中南大学资源加工与生物工程学院,长沙 410083
- 折叠
摘要
Abstract
To address the challenge of evaluating groundwater remediation effectiveness after in situ Leaching(ISL)uranium mining,this study proposes a novel quantitative assessment method based on uranium isotopic fractionation(δ238U).Taking a long-term suspended CO2+O2 ISL mining area in northern China as the research subject,systematic monitoring of δ238U values,hydrochemical parameters,and uranium concentrations in groundwater samples was conducted,revealing key geochemical behaviors during natural remediation.Preliminary exploration found that the 238U/235U fractionation factor ε in the study area is(0.46±0.07)‰,with most monitoring wells showing significantly negative δ238U values(minimum-2.49‰),indicating the occurrence of U(VI)reduction as the dominant remediation mechanism.Further research demonstrates that δ238U exhibits a significant negative correlation with redox potential(Eh)and serves as a more reliable direct indicator of U(VI)reduction extent than Eh alone.However,high concentrations of carbonate complexes can inhibit the reduction process,resulting in less negative δ238U values at strongly reducing sites(Eh<0 mV).This study confirms that δ238U can serve as an effective tracer for assessing the efficacy and stability of natural groundwater remediation in ISL mining areas,providing a scientific basis for setting remediation goals and optimizing technical strategies.关键词
地浸采铀/地下水修复/同位素分馏/铀同位素Key words
in situ leaching/groundwater remediation/isotopic fractionation/uranium isotopes分类
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高洁,江国平,徐乐昌,胡鹏华,周磊..基于铀同位素分馏(δ238U)测量的地浸采铀地下水修复还原度评估方法[J].同位素,2026,39(2):97-106,10.
