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Surface and groundwaters of El Divisorio brook (Argentina) have excessive As (WHO, USEPA, CAA: >10μgL−1). The rural population is at risk of arsenicism because groundwater is the only source of water for human consumption. We analyse geoavailability of As and other associated elements (Ba, Br, Co, Cr, Fe and Na) in the solid phase (INAA-Actlabs), determine the association between As and other elements...