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Resumo: A area em estudo contempla a bacia do rio Sao Miguel (≈520 km2), afluente do rio Sao Francisco, situada na provincia carstica de Arcos-Pains e inserida na Bacia Hidrografica do Alto Sao Francisco (235.635 km2). Com o objetivo de avaliar preliminarmente a utilizacao do mapeamento hidroquimico para verificar espacialmente a qualidade das aguas superficiais, foram realizadas analises hidroquimicas em 34 pontos da bacia em apreco durante uma estacao seca e uma chuvosa. As analises incluiram a determinacao de parâmetros fisico-quimicos (temperatura, pH, Eh, CE, STD, oxigenio dissolvido e turbidez), assim como a concentracao de ânions (NO3-, PO43-, HCO3-, SO42- e Cl-), cations maiores e elementos traco. Os dados foram tratados e comparados com os valores estabelecidos pela legislacao Conama no 357 (2005) para aguas da classe 1 os quais balizaram os valores plotados nos mapas hidroquimicos, facilitando, desta maneira, a visualizacao dos locais que violaram o limite. Foram observados valores acima dos permitidos para as concentracoes de nitrato, aluminio, ferro, cadmio, manganes e turbidez. Palavras Chave: Carste, Alto Sao Francisco, Arcos-Pains Abstract: USE OF HYDROCHEMICAL MAPPING FOR QUALITY EVALUATION OF SURFACE WATERS, SAO MIGUEL RIVER BASIN, MINAS GERAIS. The study aimed to check the waters quality of the karst region of the Sao Miguel River (≈520 Km2), a tributary of the Sao Francisco river, located in the karst province of Arcos-Pains, and belonging to the Upper San Francisco Basin (235,635 Km2). In order to evaluate the quality of surface waters with the use of hydrochemical mapping, chemical analyzes were performed in 34 basin sites during the dry season and the rainy season. The analysis included the determination of physicochemical parameters (temperature, pH, Eh, CE, STD, dissolved oxygen and turbidity), as well as the concentration of anions (NO3-, PO43-, HCO3-, SO42- and Cl-), and major cations and trace elements. The data were treated and compared with the legal parameters which marked the ranges of isovalues plotted in the hydrochemical maps through the software Arcgis 10.1, facilitating in this way the visualization of the anomalies. Anomalies were observed in relation to the maximum values for turbidity and the concentrations of nitrate, aluminum, iron, cadmium and manganese. Keywords: Karst, Upper Sao Francisco, Arcos-Pains

UTILIZAÇÃO DO MAPEAMENTO HIDROQUÍMICO PARA AVALIAÇÃO DA QUALIDADE DAS ÁGUAS SUPERFICIAIS DA BACIA DO RIO SÃO MIGUEL, MINAS GERAIS