AVALIAÇÃO DA QUALIDADE DA ÁGUA DA BACIA HIDROGRÁFICA DO RIO SÃO TOMÁS NO MUNÍCIPIO DE RIO VERDE – GOIÁS

Abstract

The human consumption water quality should be considered an essential factor for water supply services, public or private, actions development, in ways that the distributed water has all potability characteristics required by CONAMA (National Environment Council). Thereby, it is essential that water resources present appropriate physical, chemical and microbiological conditions to the water can be used by living things, must contain essential substances to life and be free from substances that can produce detrimental effects on organisms. In this context, this study aimed to monitor the SãoTomás river, along seven months (January to July 2015) in five collection points in its course, to evaluate water quality. The analyzed parameters were: electricconductivity, turbidity, pH, dissolved oxygen, total dissolved solids, total phosphorus, temperature, chemical oxygen demand, total coliforms and Escherichia coli, and all analyzis followed the Standard Methods for the Examination of Water and wastewater (USA). Most analyzed parameters showed values consistent allowed to CONAMA 357/2005 Resolution, with total phosphorus exception, which exceeded the law established limits in some collection points. Thus, it was possible to conclude that the water body in question suffers environmental impacts mainly from regional agricultural activities, and further researches are necessary to monitor, identify and quantify water pesticides, for a more accurate characterization water quality in this affluent.