Pesticide Research Journal

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.