Avaliação do estado trófico para o rio Sapucaí-Guaçu

Abstract

The release of organic matter, toxic substances and nutrients via domestic and industrial effluents, or resulting from inadequate management of land use can affect the quality of the environment to aquatic life or human health through the ingestion of contaminated water. Aiming at this, the objective of this study was to evaluate the temporal variation of trophic characteristics of Sapucai Guaçu River, in the state of São Paulo, and sort by determining the Trophic State Index proposed by Toledo Jr. (IETT) and Lamparelli (IETL) with the data quality of water between the years 2012 to 2014. The results showed that the values of the Trophic State Index (ETI) for the points evaluated in Sapucai Guaçu River, were indicative of eutrophication status, with tendency to hypertrophication both the methodology used by Toledo as the methodology used by Lamparelli. It was also observed that the phosphorus concentrations found in the samples were above the limit established in CONAMA Resolution No. 357 of 2005 to the fresh water Class 2, probably because the point of the appraised river is located in urban areas, and the higher phosphorus concentrations in water are associated with the load of domestic sewage.