- Title
- Formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans and their precursors in fires of pyrethroid pesticide alpha-cypermethrin
- Creator
- Summoogum, Sindra L.; Wojtalewicz, Dominika A.; Mackie, John C.; Kennedy, Eric M.; Dlugogorski, Bogdan Z.
- Publisher Link
- http://dx.doi.org/10th International Symposium on Fire Safety Science, 2011. Proceedings of the Tenth International Symposium on Fire Safety Science 2011 (College Park, MD 19-24 June, 2011) p. 239-252
- Publisher Link
- http://dx.doi.org/10.3801/IAFSS.FSS.10-239
- Publisher
- International Association for Fire Safety Science
- Resource Type
- conference paper
- Date
- 2011
- Description
- This study reports the results of the gas phase oxidation of alpha-cypermethrin, a common insecticide, elucidating the decomposition pathways and formation of toxic species such as polychlorinated dibenzo-pdioxins and polychlorinated dibenzofurans (PCDD/F) and their precursors. Conditions investigated are similar to those encountered in post combustion and cooling-down zones of forest, agricultural and wild fires, as well as in burning of biomass contaminated or treated with pesticides. The experiments were conducted under fuel lean conditions in a tubular reactor housed in a three-zone heating furnace and operated with a dilute stream of alpha-cypermethrin in ultra high purity nitrogen and oxygen. PCDD/F were identified and quantified by high resolution gas chromatography (HRGC)-ion trap mass spectrometry (ITMS). We detected mono to hepta chlorinated dibenzo-p-dioxins and dibenzofurans with maximum emission factors of 141 μg g-1 and 384 pg ΣTEQ-WHO2005 g-1 of alpha-cypermethrin. 1-monochlorodibenzofuran was ranked as the most abundant congener. We also conducted the analyses of volatile organic compounds (VOC) attempting to identify the PCDD/F precursors by means of HRGCquadrupole mass spectrometry (QMS). The results of VOC revealed chlorobenzene, diphenyl ether, benzaldehyde, chlorotoluene, dichlorotoluene as important PCDD/F precursors.
- Subject
- toxicity; polychlorinated dibenzo p dioxins; polychlorinated dibenzofurans; wildfires; emission factors
- Identifier
- http://hdl.handle.net/1959.13/1035974
- Identifier
- uon:13196
- Identifier
- ISSN:1817-4299
- Language
- eng
- Full Text
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