AI Article Synopsis
- The paper analyzes how dieldrin decomposes when heated, resulting in toxic byproducts like PCDD/F, which are harmful compounds formed during combustion.
- The research highlights that during the thermal decomposition, harmful elements like chlorinated benzenes and phenols are produced, which can lead to the formation of dioxins at higher temperatures (around 823 K).
- Findings show that the production of these toxic dioxins increases with temperature and oxygen content, with the most significant toxicity observed at 923 K, leading to high levels of octachlorodibenzofuran (OCDF) detected.
Article Abstract
This paper examines the gas phase thermal decomposition of dieldrin and associated formation of toxic combustion products including polychlorinated dibenzo-p-dioxin and dibenzofuran (PCDD/F). Volatile Organic Carbon (VOC) analysis revealed the formation of pentachlorostyrene (PCS), hexachlorostyrene (HCS) and polychlorinated naphthalene as toxic combustion products generated during the combustion of dieldrin. The thermal pyrolysis of dieldrin resulted in the formation of chlorinated benzenes and chlorinated phenols, which are known PCDD/F precursors. The formation of PCDD/F commenced around 823 K @ 5s residence time and results indicate a preference for the formation of PCDF over PCDD under all experimental conditions studied. Subsequent experiments, to examine the yield of PCDD/F as a function of temperature, reveal the progressive chlorination of PCDD/F with temperatures up to 923 K. Octachlorodibenzofuran (OCDF) was the major dioxin congener detected in the oxidation of dieldrin. The highest toxicity factor for dioxin formation was recorded at 923 K with a 6% O content in the feed gas and corresponds to 6.24 ng TEQ WHO 2005/mg of dieldrin and total PCDD/F concentration of 96.8 ng/mg of dieldrin.
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| http://dx.doi.org/10.1016/j.chemosphere.2019.03.010 | DOI Listing |
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