Verificação parcial da qualidade da água do Rio Curupi - Sinop-MT

Abstract

The quality of surface water, in general, reflects the uses and occupations of the soils, being able to infer the pollution by effluent discharge and agricultural practices. The objective of this work was to partially verify the water quality of the Curupi River in Sinop, Mato Grosso. For this purpose, two points, one upstream and one downstream of the Curupi River were monitored with five water harvesting during the year 2014. The parameters monitored and determined in the field were pH, electrical conductivity and oxygen Dissolved, and those monitored and determined in the laboratory were turbidity, biochemical oxygen demand (BOD), total Kjeldahl nitrogen and total phosphorus. The results showed that there was little variation between the collection points when comparing the rainy and dry periods, both in relation to the analyzes of the same point, and between both sites. The concentrations of dissolved oxygen, BOD, nitrogen and phosphorus were within the limits established for Class 2 rivers by CONAMA Resolution No. 357, 2005. The values of turbidity presented low values, indicating low concentration of suspended solids and low sediment entry in the water body. The pH values were low throughout the collection period, being lower than the minimum limit indicated by the legislation. These low values are a reflection of the underground water of the region that presents acidic waters. The results show low values of organic matter and nutrients. Considering the investigated parameters, the results show that the Curupi River presents good quality of its waters.