PHYSICAL-CHEMICAL AND MICROBIOLOGICAL QUALITY OF THE WATER FROM THE SPROUTS OF THE HYDROGRAPHIC BASIN OF THE CORURIPE RIVER, ALAGOAS-BRASIL
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Abstract
Watersheds have been suffering increasing environmental degradation, such as lack of riparian vegetation and erosion of riverbanks. It is fundamental that such regions be monitored to have an integrated survey that allows the maintenance of its quality. This work aimed to evaluate the water quality of the springs of the Coruripe river basin, on the south coast of Alagoas, Brazil. For water analysis, the following parameters were evaluated: appearance, taste, odor, true color, temperature, pH, alkalinity, total hardness, turbidity, electrical conductivity, total dissolved solids, biochemical oxygen demand, total phosphates, total nitrites, total nitrates, total sulfates, total chlorides, total iron and coliforms (total and thermotolerant). When comparing the results obtained with the standard references of quality recommended in the resolution of the Brazilian Ministry of the Environment (CONAMA) 357/2005 and/or in the ordinance of the Brazilian Ministry of Health 2914/2011, it was verified that, except for the pH, the physical and chemical parameters of all samplings showed values compatible with the limits established for class 2 fresh waters. Most samples showed bacteria from the coliform group, but none of them showed thermotolerant coliforms, which are related to fecal contamination. The calculation of the water quality index allowed classifying them as of good and reasonable quality, concluding that the springs met the potability standards of the Brazilian legislation. Therefore, proper management is very important, as well as mitigating actions for already impacted areas of the watershed, including municipal policies that seek to preserve and increase the flow of watercourses.
