太湖梅梁湾岸边带底泥中重金属的形态与分布

选择太湖梅梁湾一处没有外源污染并具有藻类富集特征的岸边带进行了底泥中重金属形态与分布的研究.结果表明,Cu, Ni和Zn在水位变幅区及水向辐射区均有一定程度的富集;Cr和Pb则在水向辐射区有所富集(富集系数>1).岸边带底泥中这5种重金属的惰性形态百分率均显著低于开阔水体底泥,其中惰性态Ni在岸边带和开阔水体底泥中的含量分别为30.68%±0.56%和34.67%±2.72%,惰性态Pb则分别为25.45%±3.82%和34.17%±0.85%.重金属在岸边带底泥中的惰性形态含量低,说明其活性形态含量高,易于向上层水体迁移.藻类捕获型岸边带底泥中除了少量重金属会向上层水体释放外,总体可以作为湖泊重金属的汇.

Distribution and speciation of heavy metals in sediments at a littoral zone of Meiliang Bay of Taihu Lake

The forms, contents and distribution patterns of 5 heavy metals(Cr, Cu, Ni, Pb, Zn) were surveyed at a lake shore of Meiliang Bay, Taihu Lake, China.This area was characterized by algal enrichment and no allochthonous pollutant input.Cu, Ni and Zn were enriched in sediment samples at both eulittoral and infralittoral subzones, while Cr and Pb were only enriched in the infralittoral subzone(enrichment factor > 1).The residual form fractions of all 5 heavy metals in sediments of the littoral subzones were low...