A baia da Ilha Grande circunda Angra dos Reis e Ilha Grande e apresenta influência antrópica tanto pela dinâmica das cidades ali instaladas, quanto pelo aumento da população quando em período de alta temporada – uma vez que esta é uma região turística. Soma-se a isso, o fato de estarem situadas nessa mesma região o Porto de Bracuhy e as duas usinas nucleares brasileiras (Angra 1 e 2), que se valem da enseada da Ribeira, localizada dentro da baia, para seu arrefecimento. Portanto esse estudo visa identificar os possíveis contaminantes nessa região, utilizando as concentrações de metais, através da análise de sedimentos de fundo. A coleta do sedimento de fundo foi realizada utilizando amostrador Van Veen. A digestão da amostra foi realizada em solução ácida e quantificada por Espectrometria de Massa Induzida por Plasma (EMPI) na qual se obteve a concentração multielementar de elementos maiores, menores e traços. A enseada da Ribeira tem seus metais fornecidos pelas atividades industriais da região, além de ter influência nos processos de sedimentação, dada pelos efluentes oriundos das usinas nucleares, e controlados por temperatura e salinidade. A partir da correlação das fontes, relacionou-se fontes naturais e antrópicas e suas concentrações média de elementos maiores e menores variam entre 6,32 e 0,06% e, os elementos traços apresentam concentrações médias entre 0,07 e 639 mg.kg -1, sendo os valores mais altos para bário, estrôncio e manganês. Estes elementos têm origem tanto antrópica quanto natural e são controlados por fatores como temperatura, correntes, procedência e natureza química de cada elemento.Palavras-chave: geoquímica ambiental, metais pesados, geologia costeira Geochemistry of the Bottom Sediments of the Ribeira Cove – Rio de Janeiro, Brazil.AbstractThe Ilha Grande bay has anthropogenic influence both due to the dynamics of the cities as well as the increase in population during high season – since this is a tourist region. Added to this, the fact that the Port of Bracuhy and the two Brazilian nuclear power plants (Angra 1 and 2), which use Ribeira Bay water for cooling processes. Therefore, this study aims to identify possible contaminants in this region, using metal concentrations, through the analysis of bottom sediments. The sampling of the bottom sediment was carried out using a Van Veen sampler; Digestion of the sample was carried out in acid solution and quantified by Inductive Plasma Mass Spectrometry ( ICP-MS) in which the multielemental concentration of major and trace elements was obtained, respectively. The Ribeira Bay has its metals supplied by industrial activities in the region, in addition to the influence on the sedimentation process, given by the effluents of the nuclear power plants, and controlled by temperature and salinity. From the correlation of sources, natural and anthropogenic sources surface distribution patterns were characterized, and their average concentrations of major and minor elements vary between 6.32 and 0.06%, and trace elements have average concentrations between 0.07 and 639 mg.kg -1, the highest values being for barium, strontium and manganese. These elements have both human and natural origin and are controlled by factors such as temperature, currents, origin and chemical nature of each element. Regardless of the fact that the results reveal less likelihood of adverse effects occurring, the increase in significant human interference in the ecosystem is indisputable, requiring constant and effective monitoring of aquatic systems such as the Ribeira Bay and conservation programs, in order not to allow the evolution of environmental degradation.Keywords: environmental geochemistry, heavy metals, coastal geology
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