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- W3132904211 endingPage "125466" @default.
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- W3132904211 abstract "Uranium (U) geochemistry and its isotopic compositions of reservoir sediments in U mine area were poorly understood. Herein, U and Th isotopic compositions were employed to investigate source apportionment and geochemical behavior of U in 41 reservoir sediments from a U mining area, Guangdong, China. The remarkably high contents of both total U (207.3–1117.7 mg/kg) and acid-leachable U (90.3–638.5 mg/kg) in the sediments exhibit a severe U contamination and mobilization-release risk. The U/Th activity ratios (ARs) indicate that all sediments have been contaminated apparently by U as a result of discharge of U containing wastewater, especially uranium mill tailings (UMT) leachate, while the variations of U/Th ARs are dominated by U geochemical behaviors (mainly redox process and adsorption). The U isotopic compositions (δ238U) showed a large variance through the sediment profile, varying from − 0.62 to − 0.04‰. The relation between δ238U and acid-leachable U fraction demonstrates that the U isotopic fractionation in sediments can be controlled by bedrock weathering (natural activity), UMT leachate (anthropogenic activity) and subsequent biogeochemical processes. The findings suggest that U-Th isotopes are a powerful tool to better understand U geochemical processes and enrichment mechanism in sediments that were affected by combined sources and driving forces." @default.
- W3132904211 created "2021-03-01" @default.
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- W3132904211 date "2021-07-01" @default.
- W3132904211 modified "2023-10-17" @default.
- W3132904211 title "Geochemical and U-Th isotopic insights on uranium enrichment in reservoir sediments" @default.
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- W3132904211 doi "https://doi.org/10.1016/j.jhazmat.2021.125466" @default.
- W3132904211 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33657470" @default.
- W3132904211 hasPublicationYear "2021" @default.
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