Oxidation states of arsenic in pyrites

Introduction Arsenic has several oxidation states. In aqueous and aerobic environment, As is present as 3+ and 5+, adsorbed on Fe hydroxides [1]. In highly reducing environment, As is present by substituting S in sulfide minerals e.g. arsenopyrite. Pyrite is a common sulfide mineral which commonly occurs in sedimentary rocks. We have interests to the As elution from such sulfides in aqueous environment. Here, As speciation analysis of pyrites was carried out.