Mode of occurrence of arsenic in four US coals

Citation
A. Kolker et al., Mode of occurrence of arsenic in four US coals, FUEL PROC T, 63(2-3), 2000, pp. 167-178
Citations number
19
Categorie Soggetti
Chemical Engineering
Journal title
FUEL PROCESSING TECHNOLOGY
ISSN journal
03783820 → ACNP
Volume
63
Issue
2-3
Year of publication
2000
Pages
167 - 178
Database
ISI
SICI code
0378-3820(200004)63:2-3<167:MOOOAI>2.0.ZU;2-I
Abstract
An integrated analytical approach has been used to determine the mode of oc currence 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 be analysis show that pyrite is the principal source of arsenic in the thre e bituminous coals, but the concentration of As in pyrite varies widely. Th e Wyodak sample contains very little pyrite; its arsenic appears to be prim arily associated with organics, as As3+, or as arsenate. Significant (10-40 %) fractions of arsenate, derived from pyrite oxidation, are also present i n the three bituminous coal samples. This information is essential in devel oping predictive models for arsenic behavior during coal combustion and in other environmental settings. Published by Elsevier Science B.V.