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22 nd Salt Water Intrusion Meeting: Salt Water Intrusion in Aquifers: Challenges and Perspectives3. RESULTS AND DISCUSSIONOut of 40 parameters analyzed in the laboratory, the variables which presented values abovethe limits of the maximum values allowed by Ordinance 518/2004 of the Ministry of Healthand by CONAMA Resolution 396/2008 were: calcium (100.00%), total hardness (75.06%),magnesium (69.00%), total dissolved solids (22.24%), sulfate (5.56%) and fluoride (5.56%)portray the natural conditions of the karst aquifer Salitre occurring throughout the area, inaddition to nitrate (83.4%) and nitrite (2.78%) may arise naturally from the excess of organicmatter in the environment or anthropogenic due to contamination caused by inadequatesanitation or, depending on the intensive use of nitrogen fertilizers. The detection chloride(16.68%) can be associated with deficiency in the circulation water or groundwater scatteredfoci of infection. The occurrence of arsenic (8.33%), present in a timely manner ingroundwater, may be related to inappropriate use of pesticides on crops in the area.The analysis of Piper diagrams (Figure 2) shows that 51.62% of the analyzed samples arecharacterized as water Calcic Bicarbonated and Mixed and 48.38% have features of Calcicand Mixed Chlorinated water.The stable isotope analyzes (Figure 3) showed evidence that the origin of salinization of theaquifer Salitre, may be either related to its interaction with the carbonate sequence featuringFormation Salitre, as with evaporation processes, and may have contribution alsotranspiration by plants. This can be diagnosed on the results of groundwater samples collectedfrom wells located in the eastern sector of the area, the amount of flow that have a lowerisotopic enrichment than those obtained from wells located in the area north-northwest,downstream of the flow, with isotopic values higher oxygen-18 ( 18 O) and deuterium (D),demonstrating that more water is evaporated and subjected to interactions with the limestoneby an interval of time. What can be seen by the increasing values of dissolved inorganiccarbon ( 13 C CID ), which highlights the fact that the isotopic enrichment occurs preferentiallyin the direction (E-W), consistent with preferential flow directions obtained in the area.The analysis of the water used for irrigation purposes showed that 88.88% of water samplesare brackish and 11.12% are saline solution. Coupled with this, 89% of the groundwateranalyzed were classified as C 3 S 1 , can normally be used for irrigation and only 11% wereclassified as C 4 S 1 , which are water should not be used for irrigation according to the danger ofsoil salinity (Figure 4).79