Natural Attenuation of Metals from Acid Drainage in Surface Waters: Effects of Organic Matter in the Association of Arsenic to Hydrous Al and Fe Oxyhydroxides and Their Particle Size Distribution

Guillermo José Arce1, Pablo Pasten1,2, Marina Coquery3, María Ignacia Abarca1 and Mauricio Montecinos1, (1)Pontificia Universidad Catolica de Chile, Santiago, Chile, (2)Centro de Desarrollo Urbano Sustentable, Santiago, Chile, (3)IRSTEA, UR RiverLy, 69625 Villeurbanne Cedex, France