Hidroquímica de águas superficiais e subterrâneas da Bacia da Gameleira, Município de Aiuaba / CE

Abstract

For samples from of surface and groundwater from Gameleira Basin, in the township of Aiuaba/CE, the principal processes that determin the chemical compositions werw studied. The area, an IBAMA reserve, is part of the IBESA Project (Implantation of Experimental Basins in the Semi Arid). Hydrochemical analyses for three dams and three dug wells indicate: (i) dam waters have the lowest TDS (< 274 mg/L) and well waters the highest (< 794 mg/L); (ii) all waters present low sodium risk in irrigation; (iii) the chemical type HCO3 -/ mixed prevails, the Cl-/Mg2+ type is found in one dug well; (iv) well C2 exhibits an elevated excess of Cl- in relation to Na+; (v) Gibbs´s diagrams reveal interaction with minerals from rocks as dominant process of mineralisation in most waters.