Mechanisms of thermal decomposition of cyclodiene pesticides, identification and possible mitigation of their toxic products

Dharmarathne, Nirmala K.; Mackie, John C.; Lucas, John; Kennedy, Eric M.; Stockenhuber, Michael

doi:10.1016/j.proci.2018.06.121

Cited by 7 publications

(2 citation statements)

References 21 publications

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“…Production, storage and wide use of pesticides can cause accidental fires in storage facilities, while contaminated plant matter subjected to wildfire provides thermal decomposition and additional pathways for generating toxic products [7][8][9][10][11]. The available literature on thermal decomposition and combustion of pesticides [8,[12][13][14][15][16][17] reports different burning behavior and patterns of thermal decomposition.…”

Section: Introductionmentioning

confidence: 99%

“…Further pyrolysis and oxidation determine fragmentation of these products [7,15]. In gases released during thermal decomposition of endosulfan, a polychlorinated pesticide, Dharmarathne et al [11] identified chlorinated styrenes and chlorinated benzenes, major precursors of toxic polychlorinated dibenzodioxins and dibenzofurans (PCDD/F). Moreover, during oxidative studies on that pesticide, they observed large concentrations of PCDD/F [18].…”

Section: Introductionmentioning

confidence: 99%

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Identification of volatile and semi-volatile organic compounds emitted during thermal degradation and combustion of triadimenol

Borucka

Celiński

Sałasińska

et al. 2019

J Therm Anal Calorim

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Thermal degradation and combustion of pesticides lead to the emission of chemicals that are harmful and dangerous for humans and the environment. The aim of the work was to study thermal decomposition of triadimenol and analyze organic compounds, in particular dioxins precursors released during that process. The thermogravimetry and differential scanning calorimetry method was used to examine the physical and chemical processes occurring under high temperatures in air atmosphere. The application of a simultaneous thermal analyzer combined with an infrared spectrometer allowed to identify substances generated during the experiments. To generate the fire effluents contained in thermal degradation products, the steady-state tube furnace was also used. The gas samples were taken using solid-phase microextraction method. Meanwhile for the detection and identification of released chemicals, the gas chromatograph with mass spectrometer was adopted. The obtained results showed that tested pesticides undergo both thermal decomposition and oxidation during thermal degradation in air. In the gases emitted during thermal decomposition, carbon oxides, hydrogen cyanide and many aliphatic and aromatic compounds were found. However, the main toxic substances identified under all tested conditions were: hydrogen cyanide, 4-chlorophenol and many substituted benzenes and polycyclic hydrocarbons. Keywords Thermal analysis Á Evolved gas analysis Á Pesticide Á Triadimenol Á Solid-phase microextraction Á Sampling and analysis of fire effluents

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Identification of volatile and semi-volatile organic compounds emitted during thermal degradation and combustion of triadimenol

Borucka

Celiński

Sałasińska

et al. 2019

J Therm Anal Calorim

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A novel approach to managing facility airborne diseases: suppressing air pathogens with smoke aerosols generated from fungicide phase transition

Gao,

Liu,

Han

et al. 2024

Pest Management Science

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BACKGROUNDEnvironmental microorganisms are major contributors to the development and spread of disease. Chemical disinfection can inhibit pathogens and play a preventive role against diseases. In agriculture, prolonging the floating time of chemical pesticides in the air has a positive effect on the control of airborne diseases. However, the interaction of chemical pesticides with airborne pathogens is not yet known.RESULTSHere, triazole fungicide was transformed into stable smoke aerosols in order to assess the feasibility of employing phase transition release pesticides for air disinfection. The phase transition had a minimal impact on hexaconazole (Hexa) and myclobutanil (Mycl), with their smoke formation rates remaining consistently >90%. In microscopic morphology, triadimenol (Tria) and epoxiconazole (Epox) are solid, and tebuconazole (Tebu), Hexa, Mycl and difenoconazole (Dife) are liquid. Liquid smoke has advantages over solid smoke in the inhibition of environmental pathogens. The floatability and spatial distribution of fungicide aerosol were optimized by the combination of smoke particles with different properties, so that the fungicide aerosol could meet the conditions of practical application. In practical applications, smoke exhibits a gentler deposition process at the target interface compared to spray, along with a more homogeneous distribution of fungicides. Moreover, fungicide smoke demonstrates superior control efficacy and leaves behind lower residual amounts on fruit.CONCLUSIONIn conclusion, the implementation of fungicide phase transition as a smoke aerosol offers a viable approach to effectively suppress pathogen aerosols and enhance the control of airborne diseases. © 2024 Society of Chemical Industry.

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Management of Environmental Waste and Pollutants: Current Trend and Research Directions

Gupta

Achary

2020

Handbook of Environmental Materials Management

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Mechanisms of thermal decomposition of cyclodiene pesticides, identification and possible mitigation of their toxic products

Cited by 7 publications

References 21 publications

Identification of volatile and semi-volatile organic compounds emitted during thermal degradation and combustion of triadimenol

Identification of volatile and semi-volatile organic compounds emitted during thermal degradation and combustion of triadimenol

A novel approach to managing facility airborne diseases: suppressing air pathogens with smoke aerosols generated from fungicide phase transition

Management of Environmental Waste and Pollutants: Current Trend and Research Directions

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