Persistence and Dissipation Behavior of Triazophos in Canal Water under Indian Climatic Conditions

Laboratory studies were undertaken in canal water (pH 8.3) spiked with Hostathion (triazophos 40 EC) at the rates of 0.25 (T1) and 0.50 (T2) μg a.i. ml−1 to investigate its persistence, dissipation, and degradation kinetics. Water samples collected on 0 (1h), 2, 5, 10, 20, 30, 45, 60, and 90 days after spiking were processed for residues of triazophos by GLC. In T1 the dissipation was 10.9, 19.1, 24.8, 40.4, 53.0, 73.0, and 83.0% in 2, 5, 10, 20, 30, 45, and 60 days. Corresponding dissipation in T2 was 9.2, 17.4, 21.2, 37.1, 50.6, 72.1, and 82.4%. In 90 days the dissipation was about 91% in both treatments. The half-life values observed were 24.87 days in T1 and 25.44 days in T2. Kinetic studies revealed that dissipation of triazophos residues followed a first-order kinetics in both spiking levels.