Avaliação da qualidade da água do Rio Vermelho, município de Rondonópolis-MT

Abstract

The present work aimed to analyze, in a spatial and temporal way, the water quality of the Red River at an upstream and downstream point of the city of Rondonópolis in the state of Mato Grosso through the evaluation of physical and chemical parameters such as pH, dissolved oxygen, turbidity, electrical conductivity, temperature and concentrations of fluoride, chloride, nitrate, nitrite, bromide, phosphate, sulfate anions and compare the results with the permitted values of CONAMA Resolution 357/2005. Ionic chromatography was the technique used for the analysis of ions. In the evaluation of the parameters, only the turbidity presented a significant temporal difference, above the maximum value allowed by CONAMA 357/2005. The electrical conductivity and temperature, in the temporal evaluation, presented higher values in the rainy period, however, below the values established by CONAMA Resolution 357/2005, dissolved oxygen presented concentrations below the limit established by the resolution in the same period. As for the concentration values obtained for the anions, at the downstream point they were higher in relation to the upstream, however, they are below those allowed by the resolution, which may be due to the proximity of Red River to the city of Rondonópolis-MT, with human activities and the accelerated urbanization process being the factors that most contribute to this result.