Bonotto, Daniel Marcos [UNESP]2014-05-202014-05-201999-01-01Geochemistry of the Earth's Surface. Leiden: A A Balkema Publishers, p. 433-436, 1999.http://hdl.handle.net/11449/32353This paper describes the results of a regional study involving the sampling of 60 pumped tubular wells drilled at the Parana sedimentary basin, Brazil, which was carried out with the purpose of evaluating the U speciation in the Botucatu-Piramboia aquifer. Uranium proved to be intensively dissolved even under the enhanced reducing conditions occurring at the most confined zones of the aquifer, and Eh-pH diagrams were utilized to evaluate the influence of temperature and pressure on the migration of the U-species within the aquifer.433-436engTrabalho apresentado em eventoWOS:000082439800103Acesso aberto7430102726026121