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

Abstract

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

Thermal properties and decomposition mechanism of disubstituted fused 1,2,4-triazoles considered as potential anticancer and antibacterial agents

“…At T max1 , the volatiles containing aromatic rings are created for all the tested compounds. This is confirmed by the appearance of the following absorption bands: C-H stretching vibrations at 3030-3097 cm −1 , N-H deformation vibrations at 1619-1640 cm −1 , C Ar = C Ar [27,[31][32][33]. This indicates the formation of the same structure aromatic compounds as those observed in helium.…”

“…The compound 1 is the molecule which does not contain chlorine atoms in its structure. When one looks at the FTIR spectra gathered at T max1 for the compound 1, one can confirm that the aromatic volatiles formed during its heating [27,31,32]. In addition, the emission of alkene compounds is also possible.…”