Abstract：
In order to understand the characteristics of speciation and ecological risk of potentially toxic element (PTE) pollution in the surface sediment of huaihe river (Anhui province), 23 surface sediment samples were collected. The occurrence characteristics of PTEs (As, Cr, Zn, Cu, Cd, Pb, Mn) were analyzed by modified continuous extraction method (BCR), and the pollution status and potential ecological risk of PTEs were comprehensively evaluated by Pollution Load Index (PLI), Geoaccumulation Index (Igeo), Enrichment Factor (EF) and the risk assessment code (RAC). Results showed that the total concentrations of As, Mn, Cd, Cr, Cu, Pb, and Zn in sediment were 14.98 ± 2.32, 936.02 ± 144.48, 0.32 ± 0.08, 161.73 ± 124.83, 40.44 ± 9.67, 15.46 ± 6.67, and 74.85 ± 26.43 mg/kg, respectively. The mean concentrations of PTEs with the increasing order of Zn < Mn < Cr < Pb < Cu < As < Cd. Most PTEs appeared to mainly associate with a dominant proportion of residual fraction suggesting lower mobility whereas Cd and Mn presented a relative higher exchangeable fraction indicating a great degree of bioavailability and easily ingested by aquatic organism. Results of pollution degree showed that 3 sampling sites belong to the pollution degree of strong pollution, and the other sampling sites belonged to the medium pollution level. The indexes EF revealed moderately enrichment of Cr, minor enrichment of Cd, Mn and As, no enrichment of Cu, Zn and Pb. The values of the Igeo and RAC demonstrated that Cd and Mn pose a high ecological risk, which deserves further attention.
摘要：
为了解淮河表层沉积物中潜在有毒元素（PTE）污染的形态特征和生态风险，收集了23个表面沉积物样品。PTE的发生特征(As，Cr,Zn,Cu,Cd,Pb,Mn)采用改进的连续萃取法(BCR)分析，利用污染负荷指数(PLI)综合评价了PTEs的污染状况和潜在生态风险,地质累积指数(Igeo)，富集因子(EF)和风险评估代码(RAC)。结果表明，砷的总浓度，Mn,Cd,Cr,Cu,Pb,沉积物中锌分别为14.98±2.32、936.02±144.48、0.32±0.08、161.73±124.83、40.44±9.67、15.46±6.67和74.85±26.43mg/kg,分别。PTEs的平均浓度随Zn
