Selênio em aguas subterrâneas da Região Noroeste do Estado de São Paulo

Abstract

The use of underground water in the public provisioning can be usually an attractive alternative for the superior quality when compared with the superficial waters, in relation to the contamination for domestic sewers and even industrial waste and also for suffer a smaller influence of the dry wet season that can restrict the volume of water captured superficially. In some districts of the Northwest Area of the State of São Paulo the public provisioning is made mainly by reception of underground water of the Guarani aquifers, through tubular wells. However, in some places of that area exists the occurrence of Selenium with concentrations above the allowed by the Ministry of Health, for underground waters. In this work the monitoring of Se was realized in four wells of the Northwest Area of the State of São Paulo, to follow the variation of the concentration of that element for a hydrologic cycle.