Diagnosis of the balneability conditions of Beira Rio beach in the municipality of Porto Nacional, Tocantins

Abstract

The Tocantins River has great water resources and it has been highly sought after for recreational activity, and it is highlighted for the beautiful beaches that are formed in its extension. It is important to remember that primary contact recreation and leisure activities have a specific criterion of sanitary safety for the purpose of balneability. This study evaluated the water quality of Beira Rio Beach in Porto Nacional - Tocantins. Microbiological analyses were performed using the indicators of the total coliform group and Escherichia coli (E. coli). The results of the monitoring were checked with the parameters established for balneability purposes defined by CONAMA Resolution N^o 274/00. The Colilert technique was used for detections and confirmatory identifications of total coliforms and E. coli. Low concentrations of E. coli were proven, which allowed the final classification in the category of 'excellent', according to CONAMA Resolution N^o. 274/00. Therefore, the waters of Beira Rio Beach, in the period of analysis and collection of samples, based on the indicator of bacteria of the E. coli group, were found within the accepted standards for balneability (primary contact recreation).