IPMA, Portuguese Institute of Sea and Atmosphere, Division of Environmental Oceanography and Bioprospection, Av. Brasília, 1449-006 Lisboa, Portugal; CIIMAR, Marine and Environmental Research Center, Rua dos Bragas, 289, 4050-123 Porto, Portugal.
IPMA, Portuguese Institute of Sea and Atmosphere, Division of Environmental Oceanography and Bioprospection, Av. Brasília, 1449-006 Lisboa, Portugal; CIIMAR, Marine and Environmental Research Center, Rua dos Bragas, 289, 4050-123 Porto, Portugal.
Mar Pollut Bull. 2014 Jul 15;84(1-2):135-46. doi: 10.1016/j.marpolbul.2014.05.026. Epub 2014 Jun 3.
Upper sediments (0-5 cm) were sampled in 94 sites of water bodies of the fifteen Portuguese estuaries characterized by distinct settings of climate, topography and lithology, and marked by diverse anthropogenic pressures. Confined areas recognized as highly anthropogenic impacted, as well as areas dominated by erosion or frequently dredged were not sampled. Grain size, organic carbon (Corg), Al and trace elements (As, Cd, Co, Cr, Cu, Hg, Ni, Pb and Zn) were determined. Normalisation of trace element concentrations to Al and Corg, correlations between elements and Principal Component Analysis (PCA) allowed identifying elemental associations and the relevance of grain-size, lithology and anthropogenic inputs on sediment chemical composition. Whereas grain-size is the dominant effect for the majority of the studied estuaries, the southern estuaries Mira, Arade and Guadiana are dominated by specific lithologies of their river basins, and anthropogenic effects are identified in Ave, Leça, Tagus and Sado. This study emphasizes how baseline values of trace elements in sediments may vary within and among estuarine systems.
在 15 个葡萄牙河口的 94 个水体的上覆沉积物（0-5cm）中进行了采样，这些河口的气候、地形和岩性特征各异，受到多种人为压力的显著影响。未对被认为高度受人为影响的封闭区域以及以侵蚀为主或经常疏浚的区域进行采样。测定了粒径、有机碳（Corg）、Al 和微量元素（As、Cd、Co、Cr、Cu、Hg、Ni、Pb 和 Zn）。将微量元素浓度归一化为 Al 和 Corg，对元素进行相关性分析和主成分分析（PCA），可以确定元素的相关性以及粒径、岩性和人为输入对沉积物化学组成的重要性。尽管粒径是大多数研究河口的主要影响因素，但米拉、阿拉德和瓜迪亚纳等南部河口受到其流域特有岩性的支配，而阿韦、莱萨、塔古斯和萨多等河口则受到人为影响的识别。本研究强调了沉积物中微量元素的基线值在河口系统内和之间可能会有所变化。
