沙颍河沈丘段底泥、土壤中砷及重金属污染与潜在生态风险评价

Pollution and Risk Assessment of Arsenic and Heavy Metals in Sediments and Soils from Shenqiu Section of Shaying River

为查明沙颍河沈丘段底泥、土壤中砷(As)和重金属污染状况及其潜在生态风险,对底泥和土壤样品中的砷(As)、铬(Cr)、汞(Hg)、镉(Cd)和铅(Pb)的含量水平进行测定,并进行潜在生态风险指数计算。结果表明,沙颍河沈丘段底泥中As含量为9.206～11.641mg·kg-1,距河5km的白果村农田土壤中As含量为8.52～80.31mg·kg-1,超标率达到57.8%,Cr、Hg、Cd和Pb的超标率分别达到32.8%、59.4%、67.2%和39.1%。沙颍河沈丘段底泥和附近村庄农田土壤中As和4种重金属的总潜在生态风险为中等生态风险,主要来源于Hg和As。

To investigate the pollution status of arsenic and heavy metals in sediments and soils from Shenqiu Section of Shaying River, the levels of As, Cr, Hg, Cd and Pb were detected and the potential ecological risks of these metals were calculated using Hakanson potential ecological risks index. The level of As was 9.206～11.641 mg·kg-1 in sediments and 8.52～80.31 mg·kg-1 in soil of Baiguo Village 5 km away from the river. The excessive rate of As was 57.8%. The excessive rates of Cr, Hg, Cd and Pb were 32.8%, 59.4%, 67.2 % and 39.1%, respectively. The total potential ecological risks of arsenic and heavy metals in sediments and soils from Shenqiu Section of Shaying River were both medium ecological risks which were mainly caused by Hg and As.