Parâmetros físico-químicos e microbiológicos da água dos bebedouros de escolas públicas estaduais de tempo integral de Teresina-PI

Abstract

For human consumption, water must have microbiological, physicochemical and radioactive parameters that meet the drinking standard and do not pose health risks. In this way, drinking water is essential to guarantee the quality of life of the population, since, due to the lack of maintenance of the water quality requirement, individuals are exposed to numerous diseases related to their contamination. Schools are places where people spend most of their time, especially in this new model of education that is full-time, often using the water from the drinking fountains there for their ingestion. It is well known that it is important to treat water intended for human consumption, as it is an excellent solvent and can carry many chemical and / or biological contaminants. In view of the above, the objective of the present study was to evaluate the physicochemical and microbiological parameters of the waters of the full-time public schools of the city of Teresina - PI, verifying if they were in compliance with current ordinance No. 2914 of 2011 of the Ministry of Health which standardizes parameters for drinking water. The collection of water for the physical-chemical and microbiological analyzes was carried out in five schools, being collected in a school of each zone of the city. Microbiological analyzes (total coliforms and Escherichia coli) and physical-chemical analyzes (pH, alkalinity, turbidity, conductivity, hardness and chlorine) were performed. Analyzing the mean and standard deviation of each sample with the analysis, it was verified that all the samples showed absence for total coliforms and E. colli. The mean values for the physicochemical analyzes were 6.69 for pH, 0.79 μS / cm of conductivity, for hardness values were found between (6¨, 4 to 12.9), turbidity of (0, 02 to 3.76), only the sample collected in the water tank supplied by the school water tank located in the center of the city presented values of alkalinity and hardness outside the parameters allowed by law. A total of 42 samples were collected from schools in different parts of the city, and 100% of the samples presented satisfactory results for the microbiological analyzes and 85% for the physicochemical analyzes