TY - JOUR AU - Pavan, Deyse Constantino AU - Miranda, Gabriela Pasiani AU - Boito Reyes, Giulia AU - Bello, José Roberto AU - Lima, Douglas Costa AU - Mardigan, Laura Paulino AU - Velho, Luiz Felipe Machado AU - Gonçalves, José Eduardo PY - 2022/11/08 Y2 - 2024/03/28 TI - Evaluation of the aquatic life quality of the Floriano river in Maringá-PR JF - Semina: Ciências Exatas e Tecnológicas JA - Semin., Exact Tech. Scienc. VL - 43 IS - 2 SE - Original Article DO - 10.5433/1679-0375.2022v43n2p115 UR - https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/45392 SP - 115-126 AB - <p>With the urban and social development of cities, residents who live in the vicinity of streams and valleys begin to suffer the consequences of the continuous release of sewage. The objective of this work was to evaluate the water quality of Floriano river, located in the Maringa-PR city. For that, four points, denoted by P1, P2, P3 and P4, were chosen. For COD analysis, all samples showed the same concentration, being less than 15 mg L<sup>−</sup><sup>1</sup>, however, in relation to BOD5 in the summer period, the points P2, P3 and P4 were within the expected limit of 2.0 mg L<sup>−</sup><sup>1</sup> for Class II surface water, according to Brazilian legislation. Regarding the analysis of the Escherichia coli count, the highest values found for the biological contamination of the stream were at points P2 and P3, equivalent to 2000 CFU/mL and 424 CFU/mL, respectively, in the spring period. These two points are located close to industrial laundries that may be associated with the release of effluents from these companies. In the analyses, high concentrations of copper (Cu), aluminum (Al) and nickel (Ni) were determined, showing an equitable distribution of human action throughout the course of the stream. These results suggest the need to implement environmental monitoring programs in surface waters in the Maringá city rivers.</p> ER -