摘要
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.
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 lower than those of the profundal subzone.The residual Ni fraction in the littoral subzone sediments was 30.68%±0.56% and was 34.67%±2.72% in that of the profundal subzone.The residual Pb fraction was 25.45%±3.82% in the littoral subzone sediments and was 34.17%±0.85% in that of profundal subzone.Less residual form fractions in the littoral subzone than those of the profundal subzone means that the more part of heavy metals in the littoral subzone was in the labile form and easy to release to the above water.In the littoral zone with algae accumulation, the sediments generally serve as a sink despite the fact that only a small part of heavy metals could release to the water layer.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2010年第3期389-394,共6页
China Environmental Science
基金
国家水体污染控制重大专项(2008ZX07314-005)
环境水质学国家重点实验室课题(08Z02ESPCR)
关键词
重金属
富集系数
形态
底泥
岸边带
heavy metals
enrichment factor
speciation
sediment
littoral
作者简介
刘红磊（1980-），男，河南邓州人，博士，主要从事水环境与水生态领域的基础研究与技术开发工作，涉及面源污染控制，污染物迁移转化，及水体生态修复．发表论文6篇．
责任作者，研究员，cqyin@263．net
