【摘要】 为评估武汉市渣子湖污染现状，通过对渣子湖底泥现场布点采样，分析了底泥中Cr、Pb、As、Hg、Ni、Cu、Zn、Cd 8种重金属和N、P、OM的含量及分布特征，并采用地累积指数法、潜在生态风险指数法、综合污染指数法和有机污染指数法对渣子湖沉积物中重金属综合污染程度和生态风险水平以及氮、磷、有机质的污染等级进行了综合评价。结果表明：渣子湖沉积物中检出的8种重金属均无严重污染，8种重金属含量均低于《农用地土壤污染风险管控标准》中的风险筛选值；渣子湖沉积物中TP含量较低，39%达到清洁状态，61%为轻度污染，其中取样点1的污染层污染最严重，超出S_TP轻度污染指标40%;渣子湖沉积物中的氮污染达到重度水平，其中污染最严重的是取样点2的污染层，超出S_TN重度污染指标347%;渣子湖沉积物中有机污染严重，各点位均达到重度污染水平，污染最严重的是点位4,OI值高达2.68。该研究结果可为武汉小微水体沉积物污染评价与分析提供理论参考。更多还原

【Abstract】 In order to evaluate the pollution status in sediments from Zhazi Lake, Wuhan, through on-site sampling of lake sediment, this paper analyzes the pollution distribution and characteristics of eight heavy metals（Cr, Pb, As, Hg, Ni, Cu, Zn, Cd）,N,P and OM,and uses the geoaccumulation index, the potential ecological risk index, the comprehensive pollution index and the organic pollution index to evaluate the comprehensive pollution degree and ecological risk level of heavy metals as well as the pollution grade of nitrogen, phosphorus and organic matter in the sediment of the Zhazi Lake.The results show that none of the eight heavy metals detected in the sediment are seriously polluted, and the contents of the eight heavy me-tals are lower than the risk screening value in the Agricultural Land Soil Pollution Risk Control Standard.In addition, the TP content in the sediment is low,39% of which is clean and 61% is slightly polluted,and the pollution layer at sampling site 1 is the most serious, exceeding the light pollution index of S_TP by 40%;the nitrogen pollution in the sediment reaches the severe level, and the most serious pollution layer is at sampling site 2,which exceeded the heavy pollution index of S_TN by 347%;the organic pollution in the sediment is serious, all points reach the severe pollution level, and the most serious pollution is point 4,with the OI value as high as 2.68.This study result may provide a theoretical reference for the evaluation and analysis of sediment pollution in small and micro water bodies in Wuhan.更多还原