- Title
- Pyrolysis of dieldrin and formation of toxic products
- Creator
- Dharmarathne, W. N. K.; Mackie, J. C.; Kennedy, E. M.; Stockenhuber, M.
- Relation
- 11th Asia-Pacific Conference on Combustion (ASPACC 2017). Proceedings of the 11th Asia-Pacific Conference on Combustion (Sydney 10-14 December, 2017)
- Relation
- Funding BodyARCGrant NumberDP160102818 http://purl.org/au-research/grants/arc/DP160102818
- Publisher
- UNSW
- Resource Type
- conference paper
- Date
- 2017
- Description
- This article investigates the gas phase pyrolysis of dieldrin, one of the most common derivatives of the cyclodiene-based group of pesticides, used extensively in the agricultural sector until its use was banned in most countries (including Australia) in the 1980s. The objective of the present study was to identify its thermal decomposition pathways and to understand the reaction pathways leading to the formation of toxic species including polychlorinated dibenzo-p- dioxins (PCDD), polychlorinated dibenzofuran (PCDF) and their precursors. In order to achieve this aim, experiments were conducted using a tubular silica reactor placed in a furnace, which was fed with a dilute stream of dieldrin in 99.999% He bath gas. The VOC products and gaseous species generated during decomposition were identified and quantified. Thermal decomposition of dieldrin commenced at 673 K, via a retro Diels-Alder elimination reaction and, hexachlorocyclopentadiene (HCCP), benzene and carbon monoxide (CO) were the initial decomposition products identified. As the decomposition temperature increased to approximately 773 K, secondary decomposition products comprising HCl, pentachlorostyrene (PCS), hexachlorostyrene (HCS), polychlorinated benzenes (CBz), and trace amounts of polychlorinated naphthalene (PCN), which are toxic environment pollutants, were identified. Polychlorinated benzenes, which were detected in this pyrolysis study, are acknowledged precursors for PCDD/F formation when O₂ is present in the reacting stream.
- Subject
- pyrolysis; dieldrin; toxic species; pesticides
- Identifier
- http://hdl.handle.net/1959.13/1386353
- Identifier
- uon:32405
- Language
- eng
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