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In this work we used the Water Quality Index (WQI) aiming to evaluate the water quality and to detect glyphosate agrotoxic concentrations In the catchment reservoir for urban supply of the São João Creek, in Porto Nacional, in the state of Tocantins, the only one source of supply which has been suffering several attacks, such as agricultural and cattle raising's exploitation, where various catchments for irrigation are situated. This study was carried out monitoring of water of the São João creek, this water resource very importance for the city of Porto Nacional TO, which has applications in multiple uses such as fishing, leasure of primary contact, water supply, landscape harmony, among others. The parameters analyzed in this work are: temperature, oxygen, pH, total nitrogen, total phosphorus, total coliforms, total solids and turbidity in the months from august 2017 to september 2018 employed in calculating the quality index National Sanitation Foundation (IQA-NSF) and glyphosate agrotoxic concentrations in sediment from the catchment reservoir for urban supply in the same period. The results showed that the water São João Creek can be classified as medium quality with an average of 69,10 seconds NSF, although some parameters compared with environmental laws were not in accordance with the standards determined by Resolutions 274/2000 and 357/2005 of the Brasilian National Council of Environment (CONAMA). On the other hand, concentrations of glyphosate agrotoxic did not exceed the limit allowed by CONAMA Resolution 357/2005, which obtained an average of approximately 0.05 μg / L for the study period, but it should be noted that in the rainy season it reached values of 0,9 μg / L, that is, values close to the permissible limit of the European Union, indicating, thus, the accumulation in the long term.

revista ibero-americana de ciências ambientais

Monitoring of water quality in the basin of São João river and detection of agrochemical glyphosate in the water reservoir for urban supply in the municipality of Porto Nacional, Tocantins, Brazil