摘要:
用ICP-AES方法测定太湖梅梁湾水体悬浮颗粒物中的Co,Cr,Cu,Ni,Pb,Zn等重金属元素,以及Al,Ba,Be,Ca,Fe,K,Mg,Mn,Na,Sr,Ti,V等相关金属元素的含量,并分析了沉积物中相关元素的含量和分布特征.悬浮物中Cr,Cu,Mn,Ni,Zn的含量显著高于表层沉积物,Al,Ba,Be,Ca,Co,Fe,K,Mg,Pb,V等元素的含量高出表层沉积物10%—30%,Sr和Ti与沉积物中的含量相当,Na的含量则显著低于沉积物.重金属元素在悬浮物中表现出较强的富集作用.从污水入湖口到湾心,悬浮物中Cr,Cu,Pb,Zn含量呈明显降低的趋势,反映出直湖港对太湖的污染作用仍十分严重.但沉积物中重金属含量并未表现出自港口到湾心显著降低的趋势,说明该区域沉积物对水体重金属污染的记录信息可能失真.水体悬浮物的重金属含量可以很好地反映水体的污染状况及其潜在的生态效应.
关键词:
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湖泊
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悬浮颗粒物
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重金属
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太湖
Abstract:
Surface water of the Meiliang Bay of Taihu Lake was sampled from river mouth to center area of the bay. Suspended solids were collected water sample in each sample site. Suspended solids and surface sediments were freeze dried and micro wave digested before determined the metals contents by ICP-AES. Contents of Al, Ba, Be, Ca, Fe, K, Mg, Mn, Na, Sr, Ti, V, Co, Cr, Cu, Ni, Pb and Zn in suspende d solids and sediments were determined. Contents of Cr, Cu, Mn, Ni, and Zn in Su spended solids were significantly higher than those in sediments. Contents of Al , Ba, Be, Ca, Co, Fe, K, Mg, Pb, and Vin suspended solids were 10%—30% higher than those in sediments. Sr and Ti contents in suspended solids were similar wit h those in sediments. And Na content in suspended solids was lower than that in sediments. It was significantly accumulated of heavy metals in suspended solids. From the river mouth to the center of Meiliang Bay, Contents of Cr, Cu, Pb, and Zn in suspended solids showed a gradually decreasing trend. This indicated the river (named Zhihugang River) still produce seriously heavy metal pollution on Meiliang Bay. Contents of heavy metals in the sediments were not showed the decre asing trend from river mouth to the center of the bay. Therefore, the record of heavy metal pollution in the lake sediment may be disturbed. The study indicated that the geochemical behaviors and ecological effects of heavy metals in suspen ded solids should be focus in shallow lakes.
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