simulated laboratory studies on dissipation kinetics of prochloraz in water at different ph levels

laboratory degradation studies were performed in water at ph 4.0, 7.0 and 9.2 using prochloraz (450 ec) formulation at the rates of 1.0 (t1) and 2.0 (t2) î¼g/ml. water samples collected on 0 (2h),3,7,15,30,45,60 and 90 days after treatments were processed for residue analysis of prochloraz by hplc-uv detector. in 60 days, dissipation was 89.12-90.53 % at ph 4.0, 84.10-88.17 % at ph 7.0, and 92.35-93.81 % at ph 9.2 in both treatments. the results indicate that at ph 7.0 the degradation of prochloraz was much slower as compared to other two. among ph 4.0 and 9.2 the degradation of compound is little faster at ph 9.2. the half-life periods observed were 18.35 and 19.17 days at ph 4.0, 22.64 and 25.08 days at ph 7.0 and 15.84 and 16.63 days at ph 9.2 at t1 and t2 doses respectively.