Degradation of Propiconazole in Canal Water Under Laboratory Conditions

Degradation behaviour of the triazole fungicide, propiconazole 1-[2 (2,4-dichlorophenyl)-4-propyl-1,3-dioxolane-2-yl methyl] 1 H-1, 2, 4-triazole, in canal water was investtgated. Canal water was spiked with propiconazole (Tilt 25 EC) at the rate of 0.0625 μg mL⁻¹ (T₁) and 0.125 μg mL⁻¹ (T₂) and kept in amber bottles. Water samples collected on 0(1 h), after spiking were processed for residues by liquid-liquid partitioning with dichloromethane. Residues were estimated by GLC - ECD equipped with capillary column. In T₁, the dissipation recorded on 1, 3, 7, 15, 30, 60 and 90 days was 7.9, 17.5, 32.7, 46.1, 54.5, 76.4 and 83.2%. Corresponding dissipation in T₂ was 8.4, 11.6, 32.8, 44.5, 52.11 74.8 and 81.5%. Thus in 90 days, more than 80% dissipation of propiconazole residues in water has been observed in both the treatments. The half life (DT₅₀) values observed were 35.8 days in T₁ and 38.2 days in T₂ treatment.