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Formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans and their precursors in fires of pyrethroid pesticide alpha-cypermethrin

Summoogum, S.L., Wojtalewicz, D.A., Mackie, J.C., Kennedy, E.M. and Dlugogorski, B.Z. (2011) Formation of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans and their precursors in fires of pyrethroid pesticide alpha-cypermethrin. In: Fire Safety Science: Proceedings of the Tenth International Symposium on Fire Safety Science, 19 - 24 June, College Park, MD, USA pp. 239-252.

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Abstract

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-p-dioxins 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 wildland 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 factor of 131 ?g g-1 and 384 pg ?TEQ-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 HRGC-quadrupole mass spectrometry (QMS). The results of VOC revealed chlorobenzene, diphenyl ether, benzaldehyde, chlorotoluene, dichlorotoluene as important PCDD/F precursors.

Item Type: Conference Paper
Publisher: International Association for Fire Safety Science
URI: http://researchrepository.murdoch.edu.au/id/eprint/26209
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