Transporte de Metais Pesados no Sedimento em Suspensão na Baía de Guanabara durante um Ciclo de Maré

• Autor(a) principal: Melo, Gustavo Vaz de
• Data de Publicação: 2004
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal Fluminense (RIUFF)
• Texto Completo: https://app.uff.br/riuff/handle/1/21261
• topic: SEDIMENTOS; Baia de Guanabara (RJ); Metais pesados; Poluição ambiental; CNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIA::OCEANOGRAFIA GEOLOGICA::GEOFISICA MARINHA

The Guanabara Bay, one of the largest bays in Brazil, is a good example of an impacted environment due to a disordered occupation on it s catchment, and has being considered one of the most degraded bay in the Brazilian littoral. The heavy metal pollution is one of the main problems to the bay. The aim of this work is to improve the knowledge about the heavy metals dynamics at the Guanabara Bay as well to evaluate the exchanges to the open ocean. To acquire the aim of this work information about heavy metal (Al, Fe, Mn, Zn, Cu, Cr, Ni, Pb, Cd, V, Hg) present on suspended matter, temperature, salinity and currents was collected at an anchor station on the bay s Central Channel, throughout a tidal cycle. The results showed a stratification of the water column that it influenced the suspended matter and current dynamic; high concentration of heavy metals; influence of tide and the iron and manganese oxide and hydroxide particles in the variation of particulate metal; and high enrichment factor value. The residual transport of the suspended matter and the Cd, Zr e V metals showed a bidirectional behavior, and Zn displayed a distinct transport pattern; witch was unidirectional, towards the ocean. Then, in the high fluvial discharge the Guanabara Bay can show high pollution degree in the particulate matter and can act as heavy metal source to the oceans.