You Mu, Hu Yunhu, Meng Ying
Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan normal university, Huainan 232001, China; National Center for Quality Supervision and Inspection of Coal Chemical Products (Anhui), Huainan 232001, China.
Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan normal university, Huainan 232001, China.
Mar Pollut Bull. 2023 Mar;188:114616. doi: 10.1016/j.marpolbul.2023.114616. Epub 2023 Jan 24.
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.
为了解淮河（安徽省段）表层沉积物中潜在有毒元素（PTE）污染的形态特征及生态风险，采集了23个表层沉积物样品。采用改进的连续提取法（BCR）分析了PTEs（As、Cr、Zn、Cu、Cd、Pb、Mn）的赋存特征，并通过污染负荷指数（PLI）、地累积指数（Igeo）、富集因子（EF）和风险评估代码（RAC）对PTEs的污染状况和潜在生态风险进行了综合评价。结果表明，沉积物中As、Mn、Cd、Cr、Cu、Pb和Zn的总浓度分别为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。PTEs的平均浓度由低到高依次为Zn＜Mn＜Cr＜Pb＜Cu＜As＜Cd。大多数PTEs主要与残留态部分相关联，表明其迁移性较低，而Cd和Mn的可交换态部分相对较高，表明其生物有效性较高，易被水生生物摄取。污染程度结果显示，3个采样点属于强污染程度，其他采样点属于中度污染水平。EF指数显示Cr为中度富集，Cd、Mn和As为轻度富集，Cu、Zn和Pb无富集。Igeo和RAC值表明，Cd和Mn具有较高的生态风险，值得进一步关注。
