GROUNDWATER QUALITY OF THE GUARANI (GAIS) AND SERRA GERAL (SGAIS) AQUIFER INTEGRATED SYSTEM IN WESTERN SANTA CATARINA, BRAZIL

Abstract

The objective of this work was to evaluate the groundwater quality of the Guarani/Serra Geral Integrated Aquifer System (GAIS / SGAIS) in a region located in the western part of the state of Santa Catarina. A total of 105 water wells were selected which five are exploring water from the Guarani Aquifer and 100 from the Serra Geral Aquifer. A sample of each well was submitted to microbiological (total coliforms and Escherichia coli) and physicochemical analyzes (dissolved oxygen, pH, turbidity, electrical conductivity, alkalinity, chlorides, fluorine, sulfates, potassium, sodium, calcium, magnesium, iron, manganese, nitrate). For analyze possible contamination by BTEX hydrocarbons (benzene, toluene, ethyl benzene, xylenes) the water of 25 wells in the urban environment was analyzed in strategic points close to possible risk of risk contamination agents. In another 25 wells in the rural area the water was collected for analyze the presence of glyphosate. Some groundwater with turbidity, pH, iron, manganese, total and thermotolerant coliforms were found in disagreement with Ministry of Health Ordinance 2914/2011. Furthermore, there was no BTEX and glyphosate contamination detected in any of the wells.