College of Resources and Environment, Southwest University, Chongqing, 400715, People's Republic of China.
College of Ecological Environmental Engineering, Guizhou Minzu University, Guiyang, 550025, People's Republic of China.
Bull Environ Contam Toxicol. 2021 Jan;106(1):18-23. doi: 10.1007/s00128-020-03014-5. Epub 2020 Oct 8.
Water and sediment samples were collected from a tributary (Ruxi River) of the Three Gorges Reservoir (TGR) to analyze the concentrations of seven heavy metals (HMs) and their fractions for better understanding the migration, bioavailability and potential environmental risk of HMs. The results indicated that the concentrations of HMs in water were lower than the Environmental Quality Standards for Surface Water Class I standards, except for Ni. Cd in sediment was found to be more sensitive to environmental changes, as the acid-soluble fraction of Cd accounted for about 40% of total Cd, and the sediment-water partition coefficient of Cd was the smallest among all the HMs. Meanwhile, multiple risk assessment methods of HMs indicated that sediment Cd in most sampling sites, significantly influenced by human activities, exhibited heavy pollution, suggesting that the Cd pollution should be attached great importance in the Ruxi River.
采集三峡水库支流（瑞溪）的水和沉积物样品，分析七种重金属（HMs）的浓度及其形态，以更好地了解 HMs 的迁移、生物可利用性和潜在环境风险。结果表明，除 Ni 外，水样中 HMs 的浓度均低于《地表水环境质量标准》I 类标准。Cd 在沉积物中对环境变化更为敏感，因为 Cd 的酸可溶部分约占总 Cd 的 40%，且 Cd 的沉积物-水分配系数在所有 HMs 中最小。同时，采用多种 HMs 风险评估方法表明，受人类活动显著影响的大多数采样点的沉积物 Cd 污染严重，表明瑞溪河的 Cd 污染应引起高度重视。
