Evaluation of physical and chemical parameters of two rivers crossed by PR 508 highway in Paranaguá/Brazil

Rivers are widely used by societies and have been degraded due to environmental impacts caused by human action over the years. This factor influences the extinction or decrease of the biological diversity of rivers and nearby regions. The anthropization on the rivers in the coastal region of Paraná causes impacts that can be evaluated through physical-chemical parameters of the local water resources. The objective of this work was to quantify the concentration of phosphate, ammonia and nitrate ions present in water samples from the Santa Cruz River and the Ribeirão River (Paranaguá - PR), which are crossed by PR 508 - Alexandra - Matinhos. The space-time sample collection took place in March and September of the year 2020. The values of turbidity, air and water temperature, concentration of phosphate, ammonia and nitrate ions were evaluated, in addition to the measurement of pH values, dissolved oxygen, electrical conductivity, total dissolved solids, in the four sampling points, being two points in each one of the evaluated water resources. The analytical investigation was carried out at the Laboratory of Environmental Impact Assessment of the Paranaguá Region (LAVIMA) using potentiometric, turbidimetric, conductometric and spectrophotometric methods. The results obtained in each of the parameters evaluated were compared to those established by National Council for the Environment (Conama) Resolution No. 357/2005. It was observed that the phosphate values obtained in the tests were higher than the maximum value recommended by the aforementioned normative resolution, and the other results presented results considered normal.