Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23537
Title: Carbon-centered free radicals in participate matter emissions from wood and coal combustion
Authors: Tian, L
Koshland, CP
Yano, J
Yachandra, VK
Yu, ITS
Lee, SC 
Lucas, D
Issue Date: 2009
Publisher: Amer Chemical Soc
Source: Energy and fuels, 2009, v. 23, no. 5, p. 2523-2526 How to cite?
Journal: Energy and Fuels 
Abstract: Electron paramagnetic resonance (EPR) spectroscopy was used to measure the free radicals in the particulate matter (PM) emissions from wood and coal combustion. The intensity of radicals in PM dropped linearly within two months of sample storage and stabilized after that. This factor of storage time was adjusted when comparing radical intensities among different PM samples. An inverse relationship between coal rank and free radical intensities in PM emissions was observed, which was in contrast with the pattern of radical intensities in the source coals. The strong correlation between intensities of free radical and elemental carbon in PM emissions suggests that the radical species may be carbon-centered. The increased g-factors, 2.0029-2.0039, over that of purely carbon-centered radicals may indicate the presence of vicinal oxygen heteroatom. The redox and biology activities of these carbon-centered radicals are worthy of evaluation.
URI: http://hdl.handle.net/10397/23537
DOI: 10.1021/ef8010096
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