Ismail, I., Khalil, N. (2020). Thermal and photolysis degradation of three profenofos formulations. Egyptian Journal of Agricultural Research, 98(2), 348-358. doi: 10.21608/ejar.2020.122588
Ismail I. Ismail; Nasr Sobhy Khalil. "Thermal and photolysis degradation of three profenofos formulations". Egyptian Journal of Agricultural Research, 98, 2, 2020, 348-358. doi: 10.21608/ejar.2020.122588
Ismail, I., Khalil, N. (2020). 'Thermal and photolysis degradation of three profenofos formulations', Egyptian Journal of Agricultural Research, 98(2), pp. 348-358. doi: 10.21608/ejar.2020.122588
Ismail, I., Khalil, N. Thermal and photolysis degradation of three profenofos formulations. Egyptian Journal of Agricultural Research, 2020; 98(2): 348-358. doi: 10.21608/ejar.2020.122588
Thermal and photolysis degradation of three profenofos formulations
Pesticides Analysis Research Department, Central Agricultural Pesticides Laboratory, Agricultural Research Center, Dokki, Giza, Egypt.
Abstract
Three commercial profenofos emulsifiable concentrate (EC) formulations 720 g/l (72% w/v) currently applied in Egypt from three different companies were studied for the effect of sunlight exposure and storage on the stability of profenofos and its relevant impurity 4-bromo-2-chlorophenol content. Exposure to sunlight and storage for more than 14 days at 54 ±2 oC indicated various degradation effects on profenofos content and increase the formation of its impurity 4-bromo-2-chlorophenol. Identification of profenofos content and degradation products were determined using GC–FID and GC-MS. From the obtained results the storage of profenofos at 54 ±2 oC at intervals 28, 42, 56 and 70 days showed serious effects on the degradation rate of profenofos and increase the rate of formation of 4-bromo-2-chlorophenol compared to exposure to sunlight for all profenofos formulations under study. The results showed variable rate of degradation of profenofos and the amount of its relevant impurity 4-bromo-2-chlorophenol for all samples sources under investigation. Analysis after storage using GC-MS identified three degradation products: 4-bromo-2-chlorophenol, O-ethyl-O-(2-chloro-4-bromo-phenyl)-phosphate and O-(4-bromophenyl) O-ethyl S-propyl phosphorothioate.
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