Hydrogeochemical controls on arsenic concentrations in the shallow aquifer within pampean region.
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Abstract
This study deals with arsenic (As) hydrogeochemistry in the unsaturated zone and shallow Pampeano aquifer. This system was studied by a borehole with undisturbed soil core extraction. These cores were subjected to mineralogical and textural analysis as well as sequential extraction procedures and chemical analysis of extracted pore waters. Results show that As is mainly adsorbed onto amorphous iron oxides and concentrations in pore waters are correlated with the adsorbed mass amount. An increase in As concentrations was observed in the interfase between unsaturated zone and the upper part of the aquifer by means of water mixing processes.
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