Vol. 12 No. 3
Persistence of chlorfluazuron in water at different ph levels
Author(s): P. GANGULY, S. R. BARIK and A. BHATTACHARYYA
Abstract: Dissipation kinetics of chlorfluazuron was studied in water maintained at different pH. Chlorfluazuron was spiked in water at the rates of 1.0 and 2.0 ìg ml-1. Water samples collected on 0 (2h after application), 3, 7, 15, 30, 60 and 90 days after application and partitioned with ethyl acetate in the respective sampling date. Samples were processed and analyzed using HPLC equipped with Photo Diode Array detector. It was found that chlorfluazuron residue degraded with increment of time and followed first order kinetics in the entire study. The calculated half-life values of chlorfluazuron in water samples were in the range between 19.55-22.81 days at acidic pH, 16.10-18.47 days at neutral pH and 10.31-13.26 days at alkaline pH irrespective of doses. The stability of this particular molecule was decreased with the increase in pH of water.
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