Accumulation of heavy metals in the lacustrine sediment of Longgan Lake, middle reaches of Yangtze River, China
Accumulation of heavy metals in the lacustrine sediment of Longgan Lake, middle reaches of Yangtze River, China
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DOI：
10.1007/s12665-012-2090-4
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发表时间：
2013-08
影响因子：
2.8
通讯作者：
H. Bing;Yanhong Wu;W. Nahm;E. Liu
中科院分区：
文献类型：
--
作者：
H. Bing;Yanhong Wu;W. Nahm;E. Liu
分析了长江中游龙感湖沉积物中重金属（铬、铜、镍、铅、锌）的时空分布特征，结合年代学资料探讨了沉积物中重金属的富集特征和历史，并分析了人为因素对沉积物中重金属的影响。结果表明，西湖流域重金属的富集程度高于东湖流域，但其浓度表现相反，说明西湖流域存在较强的人类活动。重金属的富集历史表明，1950年以前，湖泊周边区域的富集程度较低，说明湖泊受到自然作用的影响;此后，流域内人类活动的增强，导致重金属富集程度明显增加。20世纪70年代重金属富集的增加发生在中央湖区。研究表明，重金属在沉积物中的积累可能在进入沉积物之前被湖泊缓冲。相关性分析表明，沉积物中重金属元素之间存在显著的相关性，表明它们的来源相似。重金属与铝、钙、锂、铁和有机质有明显的相关性，可以表征其在沉积物中的存在形态。
Spatial and temporal distribution of heavy metals (Chromium, Copper, Nickel, Lead, and Zinc) in the sediment of Longgan Lake, middle reaches of Yangtze River, China were analyzed to discuss their enrichment characteristics and history in combination with geochronological data and to identify anthropogenic effects. The results showed that the enrichment state of heavy metals was higher in the western versus eastern lake area, although their concentrations behave in the opposite case, which demonstrated that stronger human activities existed in the western lake catchment. The enrichment history of heavy metals pointed out that prior to 1950, the enrichment state was lower in the ambient lake areas illustrating the natural effect on the lake; thereafter the human activities in the catchment enhanced markedly causing an increasing heavy metal enrichment. The increase of heavy metal enrichment in the 1970s occurred in the central lake areas. The temporal difference between the ambient and central areas elucidated that the heavy metal accumulation might be buffered by the lake before they entered the sediment. Correlation analysis revealed that there was a significant correlation between heavy metals in the sediment suggesting their similar sources. Heavy metals were distinctly related to aluminum, calcium, lithium, iron, and organic matters, which could denote their forms in the sediment.