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.

从三峡水库（TGR）的支流（汝溪河）采集了水和沉积物样品，以分析七种重金属（HMs）的浓度及其组分，以更好地了解HMs的迁移，生物利用度和潜在的环境风险。结果表明，水中的HMs浓度低于地表水环境质量标准I类标准，镍除外。发现沉积物中的Cd对环境变化更敏感，因为Cd的酸溶部分约占Cd总量的40％，Cd的沉积物-水分配系数在所有HMs中最小。同时，HMs的多种风险评估方法表明，大多数采样点中的Cd沉积物受人类活动的影响很大，呈现出重度污染，这表明在汝溪河中Cd污染应得到高度重视。