Leaching behavior of arsenic from Upper Cretaceous karst infillings materials in a fractured limestone aquifer (HESP, France)
Résumé
Arsenic (As) mobility and transport into groundwater are highly dependent on the nature of the sedimentary matrix and the groundwater parameters. In this study, a combination of chemical fractionations, mineralogical characterizations, elemental mappings, and leaching experiments investigated the distribution of As in karst infillings materials from the Hydrogeological Experimental Site of Poitiers (HESP). The influence of pH and Eh conditions, contact time and the presence of bacteria on As mobility were then evaluated. The strong association between iron and As in the matrix is consistent with the low mobility of As in circumneutral pH conditions imposed by the nature of the limestone aquifer. In addition, the alternations of redox conditions tend to increase As release whereas the contribution of the bacteria present in the groundwater seems to regulate the mobilization.
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