中国典型采煤区土壤中镉的化学形态及风险评估。
Chemical speciation and risk assessment of cadmium in soils around a typical coal mining area of China.
机构信息
CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, Shaanxi, China.
CAS Key Laboratory of Crust-Mantle Materials and the Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China; State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, Shaanxi, China.
出版信息
Ecotoxicol Environ Saf. 2018 Sep 30;160:67-74. doi: 10.1016/j.ecoenv.2018.05.022. Epub 2018 May 21.
The distribution characteristics of Cadmium (Cd) fractions in soils around a coal mining area of Huaibei coalfield were investigated, with the aim to assess its ecological risk. The total Cd concentrations in soils ranged from 0.05 to 0.87 mg/kg. The high percentage of phyto-available Cd (58%) when redox or base-acid equilibria changed. Soil pH was found to be a crucial factor affecting soil Cd fraction, and carbonate-bound Cd can be significantly affected by both organic matter and pH of soils. The static ecological evaluation models, including potential ecological risk index (PERI), geo-accumulation index (I) and risk assessment code (RAC), revealed a moderate soil Cd contamination and prensented high Cd exposure risk in studied soils. However, the dynamic evaluation of Cd risk, determined using a delayed geochemical hazard (DGH), suggested that our studied soils can be classified as median-risk with a mean probability of 24.79% for Cd DGH. These results provide a better assessment for the risk development of Cd contamination in coal mining areas.
研究了淮北煤田某采煤区土壤中镉（Cd）形态的分布特征，旨在评估其生态风险。土壤中总 Cd 浓度范围为 0.05-0.87mg/kg。当氧化还原或酸碱平衡发生变化时，高比例的植物可利用 Cd（58%）。土壤 pH 值是影响土壤 Cd 形态的关键因素，而碳酸盐结合态 Cd 可受到土壤有机质和 pH 值的显著影响。静态生态评价模型，包括潜在生态风险指数（PERI）、地积累指数（I）和风险评估代码（RAC），揭示了研究土壤中中度土壤 Cd 污染和高 Cd 暴露风险。然而，使用滞后化学危害（DGH）进行的 Cd 风险的动态评估表明，我们研究的土壤可以归类为中风险，Cd DGH 的平均概率为 24.79%。这些结果为采煤区 Cd 污染风险的发展提供了更好的评估。
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