Abstract
ABSTRACT Groundwater supplied by Beberibe aquifer, the main source for the metropolitan region north of Recife, Brazil, exhibits radioactivity because of the presence of uranium resulting from the alteration of phosphate rocks that occur at the base of the Gramame formation, which is superimposed on the aquifer. Using geochemical modelling as a tool to characterise hydrodynamic systems, studies were performed assessing uranyl ions and their interaction with other chemical and mineralogical species found in the aquifer. The results of the geochemical modelling made it possible to perform studies of uranium mobility in the aquifer, analysing the alteration of phosphate minerals and revealing the occurrence of different chemical species. This model suggests that the species present in the aquifer were available for the trophic chain and capable of affecting human health in a differentiated way.
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