Abstract
Spatial variations of fluoride concentration in groundwater in the town of Saldungaray, Argentina affect water quality for human supply and decrease the aquifer reserves. The study region is a piedmont area, located near a hill area (west) and the fluvial valley of the Sauce Grande River (east). Two hydrogeological units can be identified: bedrock and clastic sediments. These sediments consist of sandy silt with a variable amount of calcium carbonate. Its greatest thickness occurs near the river where it is 60 m. Groundwater flow coincides with topography. Fresh water is exploited from this unit and it has low salt contents (dissolved solids 400 to 800 mg/l). Fluoride concentration varies between 0.2 and 5 mg/l. The groundwater flow and hydrogeological characteristics related to spatial variations of fluoride content are analyzed. The quality of water is a critical parameter in determining the overall quality of human lives, and the occurrence of high fluoride concentrations can have a pronounced impact on groundwater quality.
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