Mechanism and kinetic properties of OH-initiated atmospheric oxidation degradation of methamidophos in the presence of O2/NO

There are several positions that OH radicals may attack. In this study, the attacking to P atom form different directions and the H abstractions from the SCH3 and OCH3 groups are thermodynamically favorable reaction pathways for the reaction of methamidophos with OH radicals due to the low barrier and strong exothermicity.47