Source apportionment and ecological risk assessment of rare earth elements in vertical profiles of paddy soils — Based on Strontium and neodymium isotope tracing combined with MixSIAR model
CAO Jie1, YAN Yu1, YU Rui-lian1, WEN Bo-sen1, HU Gong-ren1,2, CUI Jian-yong3, YAN Yan3, HUANG Hua-bin2
1. Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, China; 2. Key Laboratory of Fujian Universities for Environmental Monitoring, Xiamen 361021, China; 3. Center of Analysis, Beijing Research Institute of Uranium Geology, Beijing 100029, China
Abstract：To investigate the sources and ecological risks of rare earth elements in vertical profiles of paddy soils, soil samples from three vertical profiles of paddy soils in southeastern Fujian Province and the surrounding potential sources were collected, and the rare earth element contents and strontium-neodymium isotopic compositions in these samples were determined. The source identification was firstly performed based on rare earth element contents and geochemical characteristics of vertical profile soils and potential sources. The source contribution was then quantified by using strontium-neodymium isotopes in combination with the MixSIAR model. Finally, the contribution of potential sources to the integrated potential ecological risks of rare earth elements in the vertical profile soils were evaluated by the combined results of ecological risk assessment and MixSIAR model. The results showed that rare earth elements in the P1 vertical profile soils were mainly originated from the soil parent material, and rare earth elements reached the medium ecological risk level. Rare earth elements in the P2 vertical profile soils were influenced by chemical fertilizers, and the ecological risks of rare earth elements in the shallow soil were greater than those in the deep soil. Rare earth elements in the P3 vertical profile soils were influenced by combination factors, and the ecological risks of rare earth elements were smaller. The ecological risks of rare earth elements in vertical profile soils were influenced by human factors while natural sources cannot be ignored.
曹劼, 闫钰, 于瑞莲, 翁铂森, 胡恭任, 崔建勇, 颜妍, 黄华斌. 水稻田垂直剖面土壤稀土元素来源解析及生态风险评价——基于锶钕同位素示踪结合MixSIAR模型[J]. 中国环境科学, 2023, 43(6): 3002-3012.
CAO Jie, YAN Yu, YU Rui-lian, WEN Bo-sen, HU Gong-ren, CUI Jian-yong, YAN Yan, HUANG Hua-bin. Source apportionment and ecological risk assessment of rare earth elements in vertical profiles of paddy soils — Based on Strontium and neodymium isotope tracing combined with MixSIAR model. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 3002-3012.
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