Soil/sediment samples of four different land types were collected from aquaculture land, farmland, industrial land and river bottom sediment in the estuary area of Dagu River. The contents of Cr, Cu, Zn, As, Cd and Pb in 0–30 cm inner surface samples were detected, and the distribution characteristics of heavy metal content in surface soil/sediment of different land use types in the estuary area were analyzed. Local accumulation index method, potential risk index evaluation method and principal component analysis method were used to analyze the pollution status and sources of heavy metals. The results showed that the heavy metal accumulation levels in soil and sediment samples in the study area were As > Cd > Cu > Pb > Zn > Cr, and the heavy metal content exceeded the soil background value in Shandong Province, but the potential risks were all in a low risk state. The main sources of Cr, Zn and As are transportation sources and natural sources, while the main sources of Cd and Pb are agricultural.

中文翻译：

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河口区表层沉积物重金属富集及潜在风险评估——以大沽河为例

在大沽河口区的养殖地、农田、工业用地和河底沉积物中采集了四种不同土地类型的土壤/沉积物样品。检测了0~30 cm内表层样品中Cr、Cu、Zn、As、Cd、Pb的含量，分析了河口区不同土地利用类型表层土壤/沉积物中重金属含量的分布特征。采用局部积累指数法、潜在风险指数评价法和主成分分析法对重金属污染状况及来源进行分析。结果表明，研究区土壤和沉积物样品中重金属累积水平为As>Cd>Cu>Pb>Zn>Cr，重金属含量超过山东省土壤背景值，但潜在风险为都处于低风险状态。 Cr、Zn、As的主要来源是交通来源和自然来源，Cd、Pb的主要来源是农业。