Journal article
Formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) in oxidation of captan pesticide
Proceedings of the Combustion Institute, Vol.33(1), pp.701-708
2011
Abstract
This study assessed the emission of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD and PCDF) from captan, a commonly used fungicide, in vapour-phase oxidative pyrolysis under conditions similar to those encountered in fires and burning biomass contaminated or treated with pesticides. The laboratory-scale apparatus consisted of a pesticide vaporiser, a tubular reactor and a product sampling system. The sampling train comprised tandem XAD-2 resin cartridges to trap PCDD/F as well as an activated charcoal tube to capture the organic volatile compounds (VOC). The analyses of PCDD/F were conducted by means of high resolution gas chromatograph (HRGC) - ion trap mass spectrometer (ITMS) and analyses of VOC by HRGC - quadrupole mass spectrometer (QMS). Substantially more PCDF formed than PCDD in the oxidative pyrolysis of captan, with higher yield of total PCDD/F observed at longer residence time. As indicated by the homologue distribution of PCDD/F, only mono to tetra chlorinated congeners were detected in our measurements, with 4-monochlorinated dibenzofuran (4-MCDF) ranking as the most abundant congener. The results of VOC analysis revealed benzene and chlorinated benzenes as important PCDD/F precursors. Combining the experimental measurements and the results of quantum chemical calculations, we established the reaction pathways for formation of PCDD/F from the vapour-phase oxidative pyrolysis of this widely employed fungicide.
Details
- Title
- Formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F) in oxidation of captan pesticide
- Authors/Creators
- K. Chen (Author/Creator)D. Wojtalewicz (Author/Creator)M. Altarawneh (Author/Creator)J.C. Mackie (Author/Creator)E.M. Kennedy (Author/Creator)B.Z. Dlugogorski (Author/Creator)
- Publication Details
- Proceedings of the Combustion Institute, Vol.33(1), pp.701-708
- Publisher
- Elsevier Limited
- Identifiers
- 991005544880207891
- Copyright
- © 2010 The Combustion Institute
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.60 Herbicides, Pesticides & Ground Poisoning
- 3.60.221 Persistent Organic Pollutants
- Web Of Science research areas
- Energy & Fuels
- Engineering, Chemical
- Engineering, Mechanical
- Thermodynamics
- ESI research areas
- Engineering