PHYSICOCHEMICAL AND MICROBIOLOGICAL CONDITIONS OF THE BLUE LAKE IN ARAGUAÍNA, BRAZIL

Abstract

The relationship between urban development, gentrification and impacts on aquatic environments can be analyzed in the context of the urban lake "Lago Azul" in the city of Araguaína, State of Tocantins, in northern Brazil. We aim to characterize the quality of urban waters at different points of Lago Azul, using chemical and microbiological analyses, to contribute to a deeper understanding of the environmental condition of the lake, especially in view of the accelerated process of urbanization in the vicinity. The microbiological survey was carried out by means of multiple tubes, in which total coliform bacteria, Escherichia coli, heterotrophic bacteria, molds and yeasts were identified, in addition to the presence of Salmonella spp/Shigella spp in the water. This work analyzed samples from Lago Azul in June 2021. The results obtained were compared with the maximum values allowed by the legislation in force in CONAMA Resolution 430/2011 and CONAMA Resolution No. 357/2005. It was concluded that the waters of Lago Azul, under study during the period evaluated, are not recommended for recreation with primary contact and direct consumption without previous treatment.