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巢湖表层沉积物稀土元素分布特征及环境意义
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Abstract:
随着我国城市化和工业化的快速发展，大量污染物质排入水体，湖泊沉积物污染的问题也越来越严重。为认识巢湖流域沉积物污染状况和来源，本研究选取全湖区47个表层沉积物样品，以稀土元素为评价要素，分别研究其含量特征、空间分布、轻重稀土元素的分馏和Ce和Eu元素异常，并探讨了污染来源。研究结果表明：巢湖流域全湖区表层沉积物稀土元素平均含量明显高于环境背景值。东半湖稀土元素含量高于西半湖，总体配分模型为右倾型，轻稀土富集明显，但西半湖稀土元素分馏及轻稀土元素富集程度更为显著，农业面源污染和市政污水排放等人为活动影响是造成这一现象的原因。
With the rapid development of urbanization and industrialization in China, a large number of pollutants are discharged into the water, and the problem of lake sediment pollution is becoming more and more serious. In order to reflect pollution status of sediments in Chaohu Lake, in the present study, forty-seven surface sediment samples were selected to analyze REE concentrations, further to estimate spatial distribution, REEs fraction, Ce-anomalies and Eu-anomalies, and potential contamination sources. Results are shown as below: the average concentration of REE in Chaohu Lake was found higher than the background value. REEs show right-tilting pattern and ΣLREE significantly enriched. ΣREE was found higher in the eastern Chaohu Lake; however, a higher level of REEs fraction was found in the western Chaohu Lake, which means extensively anthropogenic activities.
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