Molybdenum speciation in asphaltite bottom ash (Seguruk, SE Anatolia, Turkey)

► There is a high level of uncertainty concerning the occurrence of molybdenum in asphaltite. This study presents the concentration and speciation of molybdenum in bottom ash of asphaltite (Seguruk, SE Anatolia, Turkey). A seven step sequential extraction process to speciation of molybdenum from asphaltite bottom ash was investigated. The most abundant form of molybdenum in samples is sulfide fraction of molybdenum. Relative abundances of the remaining fractions follow the order: residual > reducible > oxidizable > exchangeable > carbonate > water soluble.