Chemometric tools to evaluate the spatial distribution of trace metals in surface sediments of two Spanish rias
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AuthorsQuelle, C. (Cristina); Besada, V. (Victoria); Andrade, J.M. (José Manuel); Gutiérrez, N. (Noemí); Schultze, F. (Fernando); Gago, J. (Jesús); González, J.J. (Juan José)
A suite of relevant trace metals (Hg, Pb, Cd, Cu, Zn and Ni) was measured in surface sediment samples to assess the environmental situation of the largest two Atlantic Spanish ‘rías’ (a form of estuaries, ría of Pontevedra, ROP, and ría of Vigo, ROV). The level of contamination originated by these metals was assessed against international guidelines, the threshold effect, ERL, and the midrange effect, ERM. Six unsupervised and supervised multivariate chemometric techniques were applied to model each ría, compare them and select those metals that characterize the samples. This is first time that such a study is performed for these two important seafood-producing areas. Maximum concentrations at ROP occurred in the vicinities of an inner island, where Cu, Zn, Ni and Pb presented concentrations over the ERL and Hg over the ERM. Highest concentrations of metals in ROV were observed in the proximities of Vigo shipyards and port, except for Pb, with peak values in San Simon Bay. ERL limits ...
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