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长江下游青弋江、水阳江水系湖泊沉积物中重金属变化特征研究

, PP. 1177-1185

Keywords: 青弋江,水阳江,湖泊,沉积物,重金属

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Abstract:

2004~2008年在青弋江、水阳江流域石臼、固城、南漪三湖采集得到岩芯钻孔。运用核素210Pb和137Cs对获得沉积物进行定年,同时分析了岩芯沉积物金属元素,研究近代湖泊重金属演化历史以及人类活动的影响,并对重金属进行了评价。文章运用Al元素作为粒度的代用指标对重金属进行标准化,并获取了重金属富集系数。研究表明,石臼、固城、南漪三湖钻孔中Cu和Zn的富集系数高于Pb,但Pb,Zn,Cu和Cr富集系数都不超过2,并且Cr的富集系数较小。自20世纪80年代中期以来流域内人类活动对石臼湖湖泊沉积物造成了显著的重金属污染,在南漪湖则推迟了10年左右,而在固城湖其重金属污染相对不明显。根据沉积物质量基准进行评价,发现石臼、固城、南漪三湖虽然存在一定的Cu,Pb,Zn和Cr污染,但污染造成的生态效应还不明显。

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