Mil-Homens M, Stevens R L, Cato I, Abrantes F
Departamento de Geologia Marinha, Instituto Nacional de Engenharia, Tecnologia e Inovação, I.P., Estrada da Portela, Apartado 7586, 2721-866 Alfragide, Portugal.
Environ Pollut. 2007 Jul;148(2):418-27. doi: 10.1016/j.envpol.2006.12.007. Epub 2007 Feb 5.
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; EF(Pb)<3, EF(Zn)<4). EF values close to 1 suggest a largely natural origin for metal distributions in sediments from the other areas included in the study.
已对DGM - INETI存档数据集中的金属浓度（铝、铬、铜、镍、铅和锌）进行了研究，这些数据来自20世纪70年代在葡萄牙大陆架267个站点采集的沉积物。由于西部海岸和阿尔加维海岸在海洋学和沉积学环境上存在差异，存档数据集被分为两个部分。对于这两个大陆架部分，均以铝作为参考元素来定义区域地球化学基线（RGB）。2002年从葡萄牙大陆架四个不同区域采集的海底样本被叠加到这些模型上，以识别和比较相对于自然分布可能存在的金属富集情况。在特茹河附近采集的三个样本中识别出了与人为影响相关的金属富集，其特征是具有最高的富集因子（EF；EF（铅）<3，EF（锌）<4）。接近1的EF值表明该研究中其他区域沉积物中金属分布在很大程度上源于自然。
