Accelerated aqueous leaching of selenium and arsenic from coal associated rock samples with selenium speciation using ultrasound extraction |
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Authors: | I Pumure J J Renton R B Smart |
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Institution: | (1) C. Eugene Bennett Department of Chemistry, West Virginia University, PO Box 6045, Morgantown, WV 26506, USA;(2) Department of Geography and Geology, West Virginia University, PO Box 6300, Morgantown, WV 26506, USA |
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Abstract: | Ultrasound extraction was used to compare the accelerated release rates of selenium and arsenic from three rocks (BT700, BT
571 and BT 60) that are associated with mountaintop mining and valley fill coal mining practiced in southern parts of West
Virginia, USA. The concentrations of arsenic released from rocks were found to be three orders of magnitude higher than that
of selenium. The accelerated leaching rate constants were ten times higher for arsenic compared to selenium. Se (IV) was found
to be stable under ultrasound extraction conditions used whereas As (III) was quickly oxidized to As (V). BT700 was found
to have more Se (IV) compared to BT571 while BT60 did not have any significant Se (IV) concentrations. Such compositional
and kinetic information becomes important when determining suitable mining waste treatment protocols that have to be undertaken
to different types of overburden before it is dumped in valleys. |
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Keywords: | Ultrasound extraction First order kinetics Arsenic Selenium Pulverized rocks |
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