Temperature dependence of Henry's law constants of metolachlor and diazinon

Degradation and by-product formation of diazinon in water during UV and UV/H2O2 treatment

“…The diazinon k OH was then calculated by multiplying this ratio by the known k OH value of NB. Feigenbrugel et al [8] estimated the k OH value for diazinon, at 8.2 × 10 9 M −1 s −1 , based on its calculated rate of reaction with • OH in a gas phase, which is in close agreement with k OH obtained in this research in water. The LP and MP lamps have virtually similar efficiencies for the removal of diazinon in the presence of hydrogen peroxide, as indicated by the pseudo first order rate constants (Table 1).…”

“…Contamination of water by pesticides is mainly due to runoff, usually within a few weeks after application. Once in the environment, its fate depends on volatilization, hydrolysis, and photolysis [8]. Diazinon undergoes fast hydrolysis at acidic and basic conditions, with half lives of 0.5, 171, and 6 days at pH 3.1, 7.3, and 10.4 (at 20-21 • C), respectively [9,2].…”

Efficacy evaluation of low-concentration of ozonated water in removal of residual diazinon, parathion, methyl-parathion and cypermethrin on vegetable

“…equilibrium (Feigenbrugel, Calvé, & Mirabel, 2004). Although high temperature benefits the chemical reaction between oxidants and substrates, it decreases the partial pressure of dissolved ozone in aqueous condition.…”

Removal of residual pesticides on vegetable using ozonated water

“…The reactivity of a pesticide depends on its chemical nature. And the Henry's law constants at different temperature will also affect its water/air equilibrium (Feigenbrugel & Calvé, 2004). Although high temperature is beneficial for chemical reaction between oxidants and substrates, high temperature decreases the partial pressure of dissolved ozone in aqueous condition.…”