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 asp...

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Bibliographic Details
Published in:Fuel (Guildford) 2012-05, Vol.95, p.481-485
Main Authors: Aydin, Isil, Aydin, Firat, Hamamci, Candan
Format: Article
Language:English
Subjects:
Applied sciences
Ashes
Asphaltite
Asphalts
Bioaccumulation
Bottom ash
Carbon
Combustion
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fuels
Molybdenum
Sequential extraction
Speciation
Toxicity
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Summary:► 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. Asphaltites derive from petroleum origin. The combustion of asphaltites produces fly and bottom ashes that are characterized by a high content of valuable elements such as vanadium, nickel, molybdenum, uranium, thorium, sulfur and unburnt carbon. This study presents the concentration and speciation of molybdenum in bottom ash of asphaltite (Seguruk, SE Anatolia, Turkey). Determination of total molybdenum in asphaltite bottom ash was performed in two stage microwave-acid digestion followed by inductively coupled plasma optical emission spectrometer. 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. Molybdenum speciation scheme allows quantitative knowledge of molybdenum distribution in asphaltite bottom ash and their toxicity, mobility, leachability, bioaccumulation and bioavailability.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2011.09.013