富含铊-砷土壤中铊的地球化学分馏和迁移：关键控制因素。
Thallium geochemical fractionation and migration in Tl-As rich soils: The key controls.
机构信息
Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resource, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China; Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padua, Agripolis Campus, Viale dell'Università, 16, 35020 Legnaro, PD, Italy.
Key Laboratory of Water Quality and Conservation in the Pearl River Delta, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resource, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China.
出版信息
Sci Total Environ. 2021 Aug 25;784:146995. doi: 10.1016/j.scitotenv.2021.146995. Epub 2021 Apr 9.
Thallium (Tl) pollution caused by mining and processing of Tl-enriched ores has become an increasing concern. This study explored the geochemical fractionation and vertical transfer of Tl in a soil profile (200 cm) from a representative Tl-As mineralized area, Southwest China. The results showed that the soils were heavily enriched by Tl and As, with concentration ranging from 3.91-17.3 and 1830-8840 mg/kg (6.79 and 2973 mg/kg in average), respectively. Approximately 50% of Tl occurred in geochemically mobile fractions in the topsoil, wherein the reducible fraction was the most enriched fraction. Further characterization using LA-ICP-MS and TEM revealed that enriched Tl and As in soils were mainly inherited from the weathering of mine tailing piles upstream. XPS characterization indicated that Fe oxides herein may play a critical role in the oxidation of Tl(I) to Tl(III) which provoked further adsorption of Tl onto Fe oxides, thereby facilitating Tl enrichment in the reducible fraction. The findings highlight that the pivotal role of Fe oxides from mineralized area in the co-mobility and migration of Tl and As in the depth profile.
铊（Tl）污染主要来源于含铊矿石的开采和加工，已成为日益关注的问题。本研究以中国西南典型铊砷矿化区土壤剖面（200 cm）为研究对象，探讨了Tl 的地球化学分馏和垂直迁移。结果表明，土壤中 Tl 和 As 含量极高，浓度范围分别为 3.91-17.3 和 1830-8840 mg/kg（平均值分别为 6.79 和 2973 mg/kg）。约 50%的 Tl 存在于表土中地球化学活性较强的组分中，其中可还原态含量最高。进一步采用 LA-ICP-MS 和 TEM 进行特征分析表明，土壤中富集的 Tl 和 As 主要来自上游尾矿堆的风化。XPS 分析表明，其中的铁氧化物可能在 Tl(I)氧化为 Tl(III)过程中发挥了关键作用，这进一步促使 Tl 吸附到铁氧化物上，从而促进了可还原态中 Tl 的富集。研究结果强调了矿化区铁氧化物在 Tl 和 As 沿剖面共迁移和迁移过程中的关键作用。
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