Regional geochemical baselines for Portuguese shelf sediments.
Regional geochemical baselines for Portuguese shelf sediments.
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DOI：
10.1016/j.envpol.2006.12.007
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发表时间：
2007-07
影响因子：
8.9
通讯作者：
M. Mil-Homens;Rodney L. Stevens;I. Cato;Fatima F Abrantes
中科院分区：
文献类型：
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作者：
M. Mil-Homens;Rodney L. Stevens;I. Cato;Fatima F Abrantes
金属浓度（铝，铬，铜，镍，铅和锌）从DGM-INETI档案数据集进行了检查，在20世纪70年代从267个地点在葡萄牙大陆架上收集的沉积物。由于西部海岸和阿尔加维海岸的海洋学和沉积学背景不同，档案数据集分为两部分。对于这两个大陆架部分，区域地球化学基线（RGB）是用铝作为参考元素来确定的。将2002年从葡萄牙大陆架四个不同地区采集的海底样本叠加在这些模型上，以确定和比较相对于自然分布的可能的金属富集情况。在Tejo河附近采集的三个样品中发现了与人为影响相关的金属富集，其特征是富集系数最高（EF; EFPb<3，EFZn<4）。EF值接近1，表明研究中包括的其他地区的沉积物中的金属分布主要是自然起源。
Metal concentrations (Al, Cr, Cu, Ni, Pb and Zn) from the DGM-INETI archive data set have been examined for sediments collected during the 1970s from 267 sites on the Portuguese shelf. Due to the differences in the oceanographic and sedimentological settings between western and Algarve coasts, the archive data set is split in two segments. For both shelf segments, regional geochemical baselines (RGB) are defined using aluminium as a reference element. Seabed samples recovered in 2002 from four distinct areas of the Portuguese shelf are superimposed on these models to identify and compare possible metal enrichments relative to the natural distribution. Metal enrichments associated with anthropogenic influences are identified in three samples collected nearby the Tejo River and are characterised by the highest enrichment factors (EF; EFPb<3, EFZn<4). EF values close to 1 suggest a largely natural origin for metal distributions in sediments from the other areas included in the study.