电感耦合等离子体质谱研究洪湖湿地沉积柱中元素纵向分布

Elemental Profiles in Sediment Cores from Honghu Lake Wetland by ICP-MS

采集洪湖湿地两个具有代表性的湖底沉积柱进行对比,应用电感耦合等离子体质谱(ICP-MS)考察了沉积柱中微量元素及稀土元素的纵向分布特征。不同簇类的微量元素在两个沉积柱中呈现不同的纵向分布特征,微量元素富集层位存在明显的差异,表明沉积柱中微量元素的富集与沉积环境相关,直接受长江水流和交换影响的沉积柱(S1)比受洪湖湿地自身演变影响的沉积柱(S2)有更接近表层的富集层位。两个沉积柱纵向的稀土元素配分曲线呈现相似的分布特性,但分散程度不同,表明其具有相同的物源、不同的沉积环境。沉积柱中微量元素及稀土元素的纵向分布特征可以直接记录人类现代工农业活动对洪湖湿地的影响。

The vertical profiles of trace elements including rare earth elements （REEs） in the two typical sediment cores of Honghu Lake wetland were investigated using ICP-MS. The vertical profiles of trace elements in different clusters were different and the enriched horizons of elements had an obvious variation. These results indicated that the enrichment of trace element in the sediment cores is related to the sedimentary environment. The trace elements in S1 core which directly suffered from the current and exchange of the Yangtze River had enriched nearer to surface layer than those in S2 core. The similar chondrite-normalized curve of rare earth elements demonstrated that the two sediment cores had the same material source and different sedimentary environment. The vertical profiles of trace elements in the sediment cores have recorded the impacts of industry, fishery and agriculture on ecology and environment of the Honghu Lake wetland.