Intermediate to high levels of arsenic and fluoride in deep geothermal aquifers from the northwestern Chacopampean plain, Argentina.

GARCIA, M.G; MORENO, C.; FERNÁNDEZ, D. S; GALINDO M.C; SRACEK, O; HIDALGO M. DEL V

Natural Arsenic in Groundwaters of Latin America

Balkema

Lugar: London; Año: 2009; p. 69 - 79

In the southern part of the province of Tucum¨¢n (northwestern Chacompampean Plain), several wells show from intermediate to high concentrations of As (between 26 to 76 ¦Ìg L-1) and high concentrations of F- (between 0.6 and 6.0 mg L-1). These wells that penetrate saturated layers as deep as 500 mbs, show ground water temperatures above the annual average in the region. The aquatic geochemistry suggest that the source of both As and F- is mainly associated to the interaction of meteoric water with Tertiary volcanic sediments deposited in the deepest part of the sedimentary sequence. Temperature, pH and redox potential are the main factors controlling the mobility of these two elements.¦Ìg L-1) and high concentrations of F- (between 0.6 and 6.0 mg L-1). These wells that penetrate saturated layers as deep as 500 mbs, show ground water temperatures above the annual average in the region. The aquatic geochemistry suggest that the source of both As and F- is mainly associated to the interaction of meteoric water with Tertiary volcanic sediments deposited in the deepest part of the sedimentary sequence. Temperature, pH and redox potential are the main factors controlling the mobility of these two elements.