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Oxidative potential of logwood and pellet burning particles assessed by a novel profluorescent nitroxide probe

Miljevic, B., Heringa, M., Keller, A., Meyer, N. K., Good, J, Lauber, A., deCarlo, P., Fairfull-Smith, K. E., Nussbaumer, T., Burtscher, H., Prevot, A., Baltensperger, U., Bottle, S., & Ristovski, Z. (2010) Oxidative potential of logwood and pellet burning particles assessed by a novel profluorescent nitroxide probe. Environmental Science & Technology inc. News & Research Notes, 44(17), pp. 6601-6607.

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Abstract

This study reports the potential toxicological impact of particles produced during biomass combustion by an automatic pellet boiler and a traditional logwood stove under various combustion conditions using a novel profluorescent nitroxide probe BPEAnit. This probe is weakly fluorescent, but yields strong fluorescence emission upon radical trapping or redox activity. Samples were collected by bubbling aerosol through an impinger containing BPEAnit solution, followed by fluorescence measurement. The fluorescence of BPEAnit was measured for particles produced during various combustion phases, at the beginning of burning (cold start), stable combustion after refilling with the fuel (warm start) and poor burning conditions. For particles produced by the logwood stove under cold-start conditions significantly higher amounts of reactive species per unit of particulate mass were observed compared to emissions produced during a warm start. In addition, sampling of logwood burning emissions after passing through a thermodenuder at 250oC resulted in an 80-100% reduction of the fluorescence signal of BPEAnit probe, indicating that the majority of reactive species were semivolatile. Moreover, the amount of reactive species showed a strong correlation with the amount of particulate organic material. This indicates the importance of semivolatile organics in particle-related toxicity. Particle emissions from the pellet boiler, although of similar mass concentration, were not observed to lead to an increase in fluorescence signal during any of the combustion phases.

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21 citations in Web of Science®

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ID Code: 38682
Item Type: Journal Article
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record.
Keywords: oxidative potential, profluorescent nitroxide probe, biomass combustion, automatic pellet boiler , logwood stove
DOI: 10.1021/es100963y
ISSN: 1086-931X
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Aerosols (040101)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > ATMOSPHERIC SCIENCES (040100) > Atmospheric Sciences not elsewhere classified (040199)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > Physics
Copyright Owner: Copyright 2010 American Chemical Society
Deposited On: 19 Nov 2010 14:24
Last Modified: 01 Mar 2012 00:20

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