Rangel, C.M.A., Baptista Neto, J.A., Lima, L.G., Oliveira, P.S. 2013. Speciation of Phosphorus in an estuarine system inside Guanabara Bay, RJ - SE Brazil. In: Conley, D.C., Masselink, G., Russell, P.E. and O'Hare, T.J. (eds.) Proceedings 12th International Coastal Symposium (Plymouth, England), Journal of Coastal Research, Special Issue No. 65, pp. 1194–1199, ISSN 0749-0208.-->
The Guanabara Bay, located in the metropolitan region of Rio de Janeiro, comprises an urbanized and industrialized area in Brazil, which over the past decades has undergone an intense degradation process caused by the eutrophication of river systems that surround this bay. This process occurs through anthropogenic activities developed within the watershed adjacent to this estuarine environment. This article investigates the controls on sediments phosphorus (P) speciation dynamics as a function of its fractionation into chemically defined operational pools along an estuarine system. This work analyzed a total of 10 variables samples of superficial sediments collected along a Mangue estuarine system inside Guanabara Bay, RJ – SE Brazil. Monitoring phosphorus in sediment dynamics in this area is important to control the influence of seasonality and anthropogenic activity in this nutrient impact. Through analysis of the sediment total phosphorus in this system, there was contamination by phosphorus in Mangue estuarine system. Regarding the phosphorus fractionation, the various form of P are influenced by human impacts, where the main chemical fraction, in the winter and summer, associated with Fe in a reducing environment, typical of polluted environments.