Mode of occurrence of arsenic in four US coals

An integrated analytical approach has been used to determine the mode of occurrence of arsenic in samples of four widely used US coals: the Pittsburgh, Illinois #6, Elkhorn/Hazard, and Wyodak. Results from selective leaching, X-ray absorption fine structure (XAFS) spectroscopy, and electron micropro...

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Bibliographic Details
Published inFuel processing technology Vol. 63; no. 2; pp. 167 - 178
Main Authors Kolker, Allan, Huggins, F.E, Palmer, C.A, Shah, Naresh, Crowley, S.S, Huffman, G.P, Finkelman, R.B
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.04.2000
Subjects
Arsenic
Electron microprobe
Leaching
US coals
XAFS
US coals
Electron microprobe
Arsenic
Leaching
XAFS
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Summary:An integrated analytical approach has been used to determine the mode of occurrence of arsenic in samples of four widely used US coals: the Pittsburgh, Illinois #6, Elkhorn/Hazard, and Wyodak. Results from selective leaching, X-ray absorption fine structure (XAFS) spectroscopy, and electron microprobe analysis show that pyrite is the principal source of arsenic in the three bituminous coals, but the concentration of As in pyrite varies widely. The Wyodak sample contains very little pyrite; its arsenic appears to be primarily associated with organics, as As 3+, or as arsenate. Significant (10–40%) fractions of arsenate, derived from pyrite oxidation, are also present in the three bituminous coal samples. This information is essential in developing predictive models for arsenic behavior during coal combustion and in other environmental settings.
ISSN:0378-3820
1873-7188
DOI:10.1016/S0378-3820(99)00095-8