Chen Xing-Hong, Li Li-Qing, Zhang Mei-Yi, Zhang Wei-Jun, Wang Dong-Sheng, Wang Hong-Jie
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China.
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Huan Jing Ke Xue. 2022 Jan 8;43(1):230-238. doi: 10.13227/j.hjkx.202105200.
Based on the flow direction of the Fuhe River into Baiyangdian Lake, the impacted area of the Fuhe River was divided into 6 subareas, and sediments from 48 sites were collected in November 2020. The characteristics and risks of sediment nutrients and heavy metal pollution in these six subareas were investigated. The results showed that the average (TN), (TP), and (TOC) were 1841 mg·kg, 769 mg·kg, and 1.77%, respectively. The major heavy metals were Cd, Cu, Zn, Hg, and Pb, which were 3.73, 1.50, 1.42, 1.31, and 1.31 times the soil background values for Hebei Province, respectively. The TP and heavy metal (Cd, Cu, Zn, Hg, and Pb) content showed a decreasing trend from the Fuhe River estuary to the downstream Zaolinzhuang, whereas the TN and TOC content showed no marked trends. TN, TP, TOC, and heavy metals (Cd, Cu, Zn, Hg, and Pb) were enriched in surface sediments (0-10 cm). The TP content in the surface sediments (0-10 cm) of the Fuhe River estuary, Fuhe River estuary-Nanliuzhuang, and Nanliuzhuang subareas were heavily polluted; the Wangjiazhai and Guangdian subareas were moderately polluted; and the Zaolinzhuang subarea was slightly polluted. Cd and Hg were the major contributors to heavy metal pollution, which were at considerable risk and moderate risk levels, respectively. The heavy metals in surface sediments (0-10 cm) of the Fuhe River estuary, Fuhe River estuary-Nanliuzhuang, and Nanliuzhuang subareas were at a considerable risk level, and the sediments below 30 cm presented a low risk level. The leaching concentrations of heavy metals in sediments from the subarea of severe ecological risk level were far less than the identification standard values of leaching toxicity, suggesting that the sediments can be treated as general waste after dredging.
根据府河入白洋淀的流向，将府河受影响区域划分为6个分区，并于2020年11月采集了48个点位的沉积物。对这6个分区沉积物营养物质及重金属污染特征和风险进行了调查。结果表明，总氮（TN）、总磷（TP）和总有机碳（TOC）的平均值分别为1841 mg·kg、769 mg·kg和1.77%。主要重金属为镉（Cd）、铜（Cu）、锌（Zn）、汞（Hg）和铅（Pb），分别是河北省土壤背景值的3.73、1.50、1.42、1.31和1.31倍。从府河河口至下游枣林庄，TP及重金属（Cd、Cu、Zn、Hg和Pb）含量呈下降趋势，而TN和TOC含量无明显变化趋势。TN、TP、TOC及重金属（Cd、Cu、Zn、Hg和Pb）在表层沉积物（010 cm）中富集。府河河口、府河河口-南刘庄、南刘庄分区表层沉积物（010 cm）中TP含量重度污染；王家寨和光淀分区中度污染；枣林庄分区轻度污染。Cd和Hg是重金属污染的主要贡献者，分别处于高风险和中风险水平。府河河口、府河河口-南刘庄、南刘庄分区表层沉积物（0~10 cm）中重金属处于高风险水平，30 cm以下沉积物呈现低风险水平。重度生态风险水平分区沉积物中重金属的浸出浓度远低于浸出毒性鉴别标准值，表明疏浚后沉积物可作为一般废物处理。
