Avaliação ambiental do ribeirão dos carrapatos através de parâmetros físico-químicos e da aplicação de um protocolo de avaliação rápida na cidade de Itaí-SP

Abstract

The growing and uncontrolled expansion of cities has caused the depredation of urban rivers, a fact that has been taking place in Ribeirão dos Carrapatos, the main river that supplies the city of Itaí/SP. Therefore, the present study aims to analyze four points of this stream through the application of a Rapid Assessment Protocol elaborated, which, through an easy, simple and quick to use methodology, allows a visual inspection of the area, capturing the characteristics of the place to assess its environmental quality. Subsequently, an Aquaread AP 700 multiparameter probe was used in order to analyze the physicochemical characteristics of water such as: temperature, hydrogen potential, dissolved oxygen, electrical conductivity and total dissolved solids. From the results, it was possible to notice the complementation between the Rapid Assessment Protocol and the physicochemical parameters, as the areas considered most impacted by the first method were those that also had the worst water quality indices, in addition to a scarcity of vegetation on its margins. In addition to noting that the electrical conductivity and dissolved oxygen in all sections were not in accordance with the limits stipulated by CONAMA Resolution No. 357 of 2005, not allowing the stream to fit as a Class II river. It can be concluded that the areas downstream of the studied basin are the ones that suffered the greatest degradation, probably due to urbanization, when compared to the areas upstream.