Kinetics of the chemical degradation of diuron

Chemosphere. 2002 Jul;48(1):69-73. doi: 10.1016/s0045-6535(02)00043-7.


The influence of pH and buffer concentration on the chemical degradation of diuron in water has been analysed over a wide temperature range. The process irreversibly gives 3,4-dichloroaniline as the only product containing the phenyl ring. H+, OH- and phosphate buffer are efficient catalysts of the reaction. The rate constant first increases rapidly at low buffer concentrations and then gradually levels off at higher ones. At 40 degrees C and high phosphate concentration (>0.01 M), or in the extreme pH regions, the half-life is approximately 4 months and the activation energy is 127 +/- 2 kJmol(-1).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Diuron / chemistry*
  • Half-Life
  • Herbicides / chemistry*
  • Hydrogen-Ion Concentration
  • Hydrolysis
  • Kinetics
  • Phenylurea Compounds*
  • Water Pollutants / analysis*


  • Herbicides
  • Phenylurea Compounds
  • Water Pollutants
  • Diuron