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首页> 外文期刊>Environment international >Trace element pollution records in some UK lake sediments, their history, influence factors and regional differences
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Trace element pollution records in some UK lake sediments, their history, influence factors and regional differences

机译：英国某些湖泊沉积物中的痕量元素污染记录，其历史，影响因素和区域差异

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Sediment cores were taken from six sites across the UK. Apart from Banbury Reservoir in London, all the other sites are relatively remote lakes. Trace elements Pb, Zn, Cu, Cd, Cr, Ni, Sn, As and V, major elements such as Fe, Mn, Ti and Al were analysed, and organic content measured as loss-on-ignition was determined in all of these cores. The result shows that these relatively remote sites have experienced enhanced atmospheric deposition of anthropogenically derived trace elements for over 100 years, and the contamination might start before industrialisation. Trace metal contamination remains the highest level at Banbury Reservoir showing "pollution source" influence. Despite the considerable reduction in atmospheric deposition in recent years, although some of the element concentrations in the surface sediments have declined, they are still much higher than their natural background values. In these sites, trace element pollution records have been influenced by many different factors. Redox condition could affect As distribution in the sediments. Sediment matrix could also affect trace element pollution signal. Apart from direct atmospheric deposition, the distributions of trace elements in the sediments have been affected by forestry activities and catchment erosion, and more contaminated soil in-wash could increase sediment pollution whilst less contaminated soil could dilute sediment pollution. In some sites, data suggest that catchment in-wash is an important source of elements for the lakes.
机译：沉积物核心取自英国的六个地点。除了伦敦的班伯里水库外，所有其他景点都是相对偏远的湖泊。分析了痕量元素Pb，Zn，Cu，Cd，Cr，Ni，Sn，As和V，主要元素如Fe，Mn，Ti和Al，并测定了所有这些元素的有机含量，以灼烧损失的形式进行了测定核心。结果表明，这些相对偏远的地点经历了超过100年的人为衍生微量元素在大气中的沉积，并且污染可能在工业化之前就开始了。痕量金属污染仍然是班伯里水库中的最高水平，显示出“污染源”的影响。尽管近年来大气中的沉积物显着减少，但尽管表面沉积物中的某些元素浓度有所下降，但仍远高于其自然本底值。在这些地点，微量元素污染记录受到许多不同因素的影响。氧化还原条件可能影响沉积物中砷的分布。沉积物基质也可能影响微量元素污染信号。除了直接的大气沉积外，沉积物中微量元素的分布还受到林业活动和集水区侵蚀的影响，更多的污染土壤在冲洗中会增加沉积物污染，而较少污染的土壤则可以稀释沉积物污染。在某些地方，数据表明，集水区是湖泊中重要的元素来源。

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