ENVR 152 |
| The hydrolysis of diazinon and diazoxon were carefully investigated from pH 1 to 10 at both 25 and 50 °C. Experimental data indicated that the hydrolysis of diazinon or diazoxon is both acid- and base-catalyzed and the amount of IMP formed is equal to the amount of parent compound degradated. When the pH is in the range of 1 to 5, the kinetics can be expressed by a two-species distribution model. Three possible mechanisms have been proposed: I) at low pH, H2O attacks the carbon-6 in the pyrimidine ring after diazinon or diazoxon gets protonated, II) at medium pH, H2O attacks the phosphorus atom and III) at high pH, OH- attacks the phosphorus atom. |
|
General Papers
6:00 PM-8:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Environmental Chemistry |