Testes de significância aplicados ao estudo da DBO (Demanda Bioquímica de Oxigênio) em ambientes urbanos impactados na região do polo industrial da Zona Franca de Manaus

Abstract

The BOD Analysis - Biochemical Oxygen Demand, is one of the most important analyzes to be performed on domestic and industrial effluents. It can evaluate the level of degradation of organic matter in that environment. As a large part of urban water bodies in Brazil are at a high level of degradation, the BOD analysis can explain a lot about the degree of anthropic influence in these environments. Given the high level of degradation in the quality of these waters, these samples tend to be diluted, and as is known, much can be lost in these dilutions. In view of this problem, this study aimed to evaluate five dilutions (100x, 50x, 33.3x, 25x and 20x) of BOD samples in the Igarapé do Quarenta by the Winkler method between the months of September and October 2019.. F tests were applied to judge which dilution would be the most accurate. The results showed that the dilutions of 25x and 20x were the most accurate, and that the amount of solvent in these dilutions modifies the disposition of oxygen consumed in the medium.