DECOMPOSITION OF DIAZINON IN AQUEOUS-SOLUTION BY OZONATION

The decomposition of diazinon in aqueous solution by ozonation was stu died under various solution pH values, gaseous ozone dosages, gaseous pressure, alkalinity levels and solution temperatures. Ozonation has b een shown to be feasible for achieving nearly complete decomposition o f diazinon within 1 h. The surface tension of aqueous solution was fou nd to be affected by the dissolved diazinon and influenced the oxidati on mechanism of diazinon by ozonation in aqueous solution. The gas-liq uid reaction model was well used to describe the transfer and reaction behaviors of reacting species in the system. The quasi-global kinetic s based on a simplified consecutive reaction scheme was developed to d escribe the temporal behavior of diazinon decomposition in aqueous sol ution by ozonation. (C) 1998 Elsevier Science Ltd. All rights reserved .