Avaliação bacteriológica de águas envasadas (água mineral e adicionada de sais)

Abstract

This study aimed to evaluate the microbiological quality of bottled water (mineral and containing salts) marketed in different parts of the city of Fortaleza. Twenty water sample were collected, eleven (11) in 500 mL bottles and nine (9) in 20 liter bottles. Microbiological analysis included the determination of the total number of bacteria (bacterial load) and the survey for total and fecal coliform bacterias. Three methods were used for bacterial count: multiple-tube fermentation technique, aerobic plate count and membrane filter technique) and a specific technique to detect coliform bacteria. The bacteria count from these three techniques revealed that 70% of the samples showed above the safety limit for potable water, and between the 30% which were within acceptable limits, 10% of these showed no microbial contamination. The results showed bad bacteriological quality results, like above 500 CFU/mL and the presence of coliform bacteria, according to Regulation No. 2914, from Ministério da Saúde, released in 12 December 2011. According to the total coliform survey, 25% of the samples were disapproved, every one of them from the 20 liter bottles, and no sample showed fecal coliform bacteria. In addition to the bacteriological evaluation, the pH of the samples was also measured, and only 60% of them were within legal limits. Therefore, it is important to take preventive measures in the preparation of bottled water, following good manufacturing practices, packaging, transportation and washing of returnable containers, offering to the consumer a safe product.