Rani_2001_Ecotoxicol.Environ.Saf_50_82

Laboratory studies were undertaken in canal water (pH 8.3) spiked with Hostathion (triazophos 40 EC) at the rates of 0.25 (T(1)) and 0.50 (T(2)) microg 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 T(1) 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 T(2) 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 T(1) and 25.44 days in T(2). Kinetic studies revealed that dissipation of triazophos residues followed a first-order kinetics in both spiking levels.