Thermoanalytical investigations of some chloro-organic pesticides and related compounds

Thermal analysis and kinetic study of decomposition processes of some pesticides

“…Thermodynamic and kinetic data (reported in Tables 3 and 6) show that the chlorine atom stabilizes the common structure more than the methoxy group and the structure of DDE is more stable than that of DDT in spite of the presence of a double bond. It can be hypothesized, in agreement with the complementary studies involving the identification of the reaction products [16], that DDT and Methoxychlor lose hydrochloric acid as can be observed from the respective first stage of decomposition. -12 E temperature at 451 K.) Thus DDT changes [16] into DDE in the solid phase and shows a similar thermal behaviour; Methoxychlor also becomes similar to DDE, but, as it bears two methoxy groups instead of the chlorine atoms, it shows a large difference in the thermal behaviour."…”

“…It can be hypothesized, in agreement with the complementary studies involving the identification of the reaction products [16], that DDT and Methoxychlor lose hydrochloric acid as can be observed from the respective first stage of decomposition. -12 E temperature at 451 K.) Thus DDT changes [16] into DDE in the solid phase and shows a similar thermal behaviour; Methoxychlor also becomes similar to DDE, but, as it bears two methoxy groups instead of the chlorine atoms, it shows a large difference in the thermal behaviour." these compounds volatilize and decompose with a weight loss of 50% while DDE starts to volatilize (onset temperature 501.8 K) without decomposition, [16] as can be observed from the weight loss (I00%).…”

“…-12 E temperature at 451 K.) Thus DDT changes [16] into DDE in the solid phase and shows a similar thermal behaviour; Methoxychlor also becomes similar to DDE, but, as it bears two methoxy groups instead of the chlorine atoms, it shows a large difference in the thermal behaviour." these compounds volatilize and decompose with a weight loss of 50% while DDE starts to volatilize (onset temperature 501.8 K) without decomposition, [16] as can be observed from the weight loss (I00%). Let us consider now pesticides of I-3-5 triazine derivatives class.…”

Mechanism of thermal decomposition of a pesticide for safety concerns: Case of Mancozeb

“…temperature and atmosphere) were published in the literature and mainly concern organochlorine pesticides [6,7] and organo-phosphorus pesticides [7][8][9]. Micro scale experiments of combustion were conducted by Nageswara Rao to characterize and quantify combustion products of several pesticides (monochrotophos, chloropyriphos, butachlor and hexachlorobenzene).…”

Thermal degradation of pesticides under oxidative conditions

“…Thermal degradation of some pesticides has already been addressed in past literature [16][17][18][19][20][21][22][23][24][25][26] in particular that of aldoximes [17][18][19][20] and chlorine pesticides [21]. The latter indeed received special attention because of the possibility of formation of very toxic chlorine containing species in case of chemical fires.…”