https://scholars.lib.ntu.edu.tw/handle/123456789/571616
標題: | Geochemical and U-Th isotopic insights on uranium enrichment in reservoir sediments | 作者: | CHUAN-CHOU SHEN HONGCHUN LI |
關鍵字: | Binary alloys; Geochemistry; Isotopes; Sediments; Uranium; Anthropogenic activity; Biogeochemical process; Geochemical behaviors; Geochemical process; Isotopic composition; Isotopic fractionations; Source apportionment; Uranium mill tailings; Thorium alloys; ferric oxide; uranium; uranium 234; uranium 238; bedrock; biogeochemistry; discharge; geochemical method; isotopic fractionation; leachate; source apportionment; wastewater treatment; adsorption; Article; China; extended X ray absorption fine structure spectroscopy; geochemical analysis; leaching; mine tailings; mining; oxidation; oxidation reduction reaction; sediment; wastewater; X ray photoemission spectroscopy; China; Guangdong | 公開日期: | 2021 | 卷: | 414 | 來源出版物: | Journal of Hazardous Materials | 摘要: | 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. ? 2021 Elsevier B.V. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85101715592&doi=10.1016%2fj.jhazmat.2021.125466&partnerID=40&md5=beddfb36352686053eea0f3e1d1e93db https://scholars.lib.ntu.edu.tw/handle/123456789/571616 |
ISSN: | 3043894 | DOI: | 10.1016/j.jhazmat.2021.125466 |
顯示於: | 地質科學系 |
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