ABSTRACT
Recent studies on arsenic (As) occurrence particularly in The Celaya Valley Aquifer (CVA) waters show that several sources of drinking water have elevated concentrations above national and international guidelines. In Villagrán and Juventino Rosas Municipalities, elevated concentrations of As above WHO guideline (10 µg/L) In both sites depending on groundwater as drinking water sources. Anthropogenic sources have been discarded to cause As presence, that may be due to water-rock interaction processes. However, the natural arsenic content in the geological environment is unknown. In this study, an assessment of arsenic was realized for volcanic and sedimentary rocks, collected from 14 sampling places along the southeastern of El Bajío Guanajuatese, Guanajuato, Mexico. These geological materials are representative of the hydrogeological environment. The high arsenic content occurs in volcanic rocks, this information will be used to identify if the proposed hydrogeochemical processes are related to the release and remotion of arsenic in the aquifer.
