Heavy metal spatial variability and historical changes in the Yangtze River estuary and North Jiangsu tidal flat.
Heavy metal spatial variability and historical changes in the Yangtze River estuary and North Jiangsu tidal flat.
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DOI：
10.1016/j.marpolbul.2015.07.006
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发表时间：
2015-09
影响因子：
5.8
通讯作者：
Zhiyong Liu;S. Pan;Zhuyou Sun;Renfeng Ma;Lanhua Chen;Yanlong Wang;Shuao Wang
中科院分区：
文献类型：
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作者：
Zhiyong Liu;S. Pan;Zhuyou Sun;Renfeng Ma;Lanhua Chen;Yanlong Wang;Shuao Wang
研究了长江口和苏北滩涂重金属的时空分布特征。长江口表层沉积物中大部分重金属在归一化为钛后向海中迁移。岩心记录表明，近50年来重金属的变化主要与微量元素的自然风化输入有关。但两个研究区均存在明显的重金属污染(主要是镍、铅、镉、铜和砷)，人为污染占总污染的23%~40%。连续提取表明，铅、铜和镍主要存在于非残留组分中，这表明研究区具有潜在的生物有效性。扫描电子显微镜/能谱分析结合顺序提取，便于以简单的方式追踪河口和潮滩中重金属的来源/来源。
This research focuses on the spatial and temporal patterns of heavy metals from the Yangtze River estuary and the tidal flat of north Jiangsu. Most heavy metals in the surficial sediments after normalization to Ti decreased seaward at the Yangtze River estuary. The core records showed that the heavy metal variations in the last 50 years were primarily linked to natural weathering input of trace elements. However, significant heavy metal pollution (mainly Ni, Pb, Cd, Cu and As) were in the two study areas, with anthropogenic inventories accounting for 23–40% percent of the total pollution. Sequential extraction showed that Pb, Cu and Ni were present largely in the non-residual fraction, which indicated the potential bioavailability in the study areas. The SEM/EDS together with sequential extraction facilitated the easy tracing of the origin/sources of heavy metals in a simple way in the estuary and the tidal flat.