Estudo isotópico e geoquímico dos sedimentos costeiros da Costa Verde do Estado do Rio de Janeiro para identificação de atividades antrópicas

• Autor(a) principal: Souza, Ariadne Marra de
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/7013
• topic: Environmental Geochemistry; Isotopic Geology; Heavy Metal; Coastal Geology; Geoquímica Ambiental; Geologia Isotópica; Metais Pesados; Geologia Costeira; CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIA

The Costa Verde is located in Rio de Janeiro State, it were located the Ilha Grande, an important tourist hub of the state. It is composed of Sepetiba and Ilha Grande bays, which be compartmentalize in several coves. The main inlets are Sepetiba, Marambaia, Mangaratiba, Angra dos Reis, Riberia, Frade and Paraty. This study was conduct in the coves of Mangaratiba, Angra dos Reis and Ribeira and wish was compiled Sepetiba and Marambaia data studied by other authors. The survey intends identify metals, their sources, and the mechanisms that control of those coves, also proposal a new concentration values than indicate contamination processes. The method involve collected of bottom sediment using van Veen and analyzed by total digestion in the mass spectrometer which was obtained Ca, Cd, Co, Cr, Cu, K, Pb, In, Ni, Sr, S, U, V and Zn concentration, in addition to the lead isotope ratios, main 206Pb/207Pb ratio. The results shown wish were Mangaratiba cove has the highest metals concentrations and they are predominantly anthropogenic whose sources are the developments located on the shore of this bay, including TEBIG. The Angra dos Reis cove also features high metals concentrations, from domestic sewage, industrial waste that includes the Verolme shipyard and strong control of the cove basis. Ribeira cove has its metals provided by Bracuhy port and an unknown source that controlled by the CNAAA effluents. Regarding the interaction between the five coves it was a mutual exchange of metals controlled by the Coast dynamics and pronounced by the Ilha Grande Channel (connecting the two bays), where the dispersion of metals are also controlled by temperature, sediment fraction, depth and salinity. The main metals related to anthropogenic sources in Costa Verde are Co, Cr, Cu, Mn, Ni, Pb and Zn. Concentration used by CONAMA resolution do not comply a reality South Brazilian coast, than are proposal a new values of control less permissive