Distribuição, disponibilidade e destino de elementos-traço em um tributário da Baía de Sepetiba: Rio Cabuçu-Piraquê (Rio de Janeiro, RJ)

• Autor(a) principal: Alves Neto, José Lucas
• Data de Publicação: 2014
• 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/1/15631
• topic: Heavy metal; trace elements; cadmium; zinc; sediment; water; bioavailable fractions; trace metal extraction; Speciation; contamination; estuary; Sepetiba bay; Rio de Janeiro; Metal pesado; elementos-traço; cádmio; zinco; sedimento; água; frações biodisponíveis; extração de metal-traço; especiação; contaminação; estuário; baía de Sepetiba; Rio de Janeiro; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA::QUIMICA ANALITICA::ANALISE DE TRACOS E QUIMICA AMBIENTAL

In this work was studied the Cabuçu-Piraquê River, a tributary of Sepetiba Bay, which has a history of pollution for decades, which presents a history of pollution for several decades, however with no records in the literature about systematic studies involving the origins and fate of trace elements, such as cadmium and zincin its environmental compartments. The bioaccumulation of these elements can cause serious damage to the biota of mangroves in its estuary, and to human consumers of local fisheries. It was evaluated the current state of contamination of water and sediment from that river, as well as the occurrence of the transport and accumulation of these elements in the estuary´s sediment fraction brought by the bay waters during high tides. Concentrations of cadmium and zinc above those considered safe by Brazilian law were found both in the fine fraction (< 63 µm) of sediment, and at high tide waters. Both elements were found only in the most bioavailable operating fractions of waters, while sediment average values above 90 % were found at same fractions. From the concentrations of these elements in water from the saline wedge generated by the bay, it was possible to infer such an influx into the estuary from the material present in the bay waters, and this transport process may be shipping a major contributor to contamination of the local mangroves