Experimental simulation of arsenic desorption from Quaternary aquifer sediments following sea water intrusion

摘要

Alluvial sediments from the coastal area in southern Tuscany (Italy) characterized by a significant As anomaly (As > 500 mg/kg) are subjected to seawater intrusion due to groundwater exploitation. Sequential extractions and kinetic experiments were carried out on Quaternary alluvial sediments to quantify the interaction between As oxianions (adsorbed on mineral surfaces) and Cl- in solutions and to establish if this mechanism may contribute to the release of As in groundwater.