太湖流域沉积物营养盐和重金属污染特征研究
发布时间：2019-01-04 20:40
【摘要】：以太湖流域不同分区水体表层沉积物为研究对象,通过对流域表层沉积物103个点位的氮、磷(TN、TP)和8种重金属(Hg、As、Cu、Zn、Pb、Cd、Ni、Cr)的分析,对氮、磷和重金属空间分布特征和生态风险进行评价.结果表明,表层沉积物TN含量呈现:Ⅱ11区(湖西丘陵区)Ⅱ21区(无锡虞农田区)Ⅱ12区(浙西山区)Ⅱ23区(沪苏嘉农田区)Ⅱ22区(太湖湿地区),其值介于550~3453mg/kg之间.TP含量分布为Ⅱ23区Ⅱ21区Ⅱ22区Ⅱ11区Ⅱ12区,其值介于320~2481mg/kg之间.太湖流域水体表层沉积物重金属的含量分布特征为Ⅱ23区、Ⅱ21区较高,Ⅱ12区、Ⅱ11区、Ⅱ22区较低.综合污染指数评价(FF)对营养盐评价结果表明,太湖流域水体表层沉积物氮磷污染情况严重,整个太湖流域水体表层沉积物营养盐污染等级呈现:Ⅱ12区整体Ⅱ21区Ⅱ11区Ⅱ23区Ⅱ22区的分布.重金属综合潜在生态风险指数(RI)表明,太湖流域水体表层沉积物重金属污染呈现Ⅱ21区最高,其次是Ⅱ23区、Ⅱ12区、Ⅱ22区,最低为Ⅱ11区.进一步运用地积累指数法(Igeo)表明,太湖流域表层沉积物重金属As、Cu、Zn、Pb、Ni、Cr污染状况较轻,而潜在生态危害指数法(Er)表明Hg、Cd的风险等级高,是造成太湖流域水体表层沉积物生态风险的主要因素.
[Abstract]:The surface sediments of different subzones of Taihu Lake Basin were studied. The nitrogen, phosphorus (TN,TP) and eight heavy metals (Hg,As,Cu,Zn,Pb,Cd,Ni,Cr) of 103 sites of surface sediments in Taihu Lake Basin were analyzed. The spatial distribution characteristics and ecological risk of phosphorus and heavy metals were evaluated. The results showed that the content of TN in surface sediments was as follows: zone 鈪，
本文编号：2400769
[Abstract]:The surface sediments of different subzones of Taihu Lake Basin were studied. The nitrogen, phosphorus (TN,TP) and eight heavy metals (Hg,As,Cu,Zn,Pb,Cd,Ni,Cr) of 103 sites of surface sediments in Taihu Lake Basin were analyzed. The spatial distribution characteristics and ecological risk of phosphorus and heavy metals were evaluated. The results showed that the content of TN in surface sediments was as follows: zone 鈪，
本文编号：2400769
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