Laboratory degradation studies were performed in water at pH 5.2, 7.0 and 8.2 using flufenacet (FOE- 5043) formulation at the rates of 0.5 (T1) and 1.0 (T2) μg, mL−1. Water samples collected on 0 (1 h), 2, 5, 8, 11, 14, 16 and 28 weeks after treatments were processed for residues of flufenacet by GC-ECD capillary system. In 28 week, dissipation was 96–97% at pH 5.2, 95–98% at pH 7.0 and 96–98% at pH 8.2 in both the treatments showing almost no effect of pH on dissipation. The half -life periods observed were 32 and 37 days at pH 5.2, 34 and 38 days at pH 7.0 and 30 and 35 days at pH 8.2 at T1 and T2 doses, respectively. Dissipatton followed a triiphasic first order kinettcs in water at all the three pH levels.
Flufenacet, PH, Dissipation kinetics, Half-life
