Study On Eliminating Trend And Residues Of 20% Triazopho EC In Cabbage And Soil

The pesticide maybe do harm to environment when it be applied incorrectly, ,as a high efficiency insecticide, triazopho is a substitute of methamidopho and will take a key role in the future. This paper has discussed the experiment that the residues and eliminating trend of 20% triazopho EC, in accordance with this experiment, the analysis rules on residues of triazopho in cabbage by gas chromatography had been constructed, and 20% triazopho EC had been recommended to control caterpillar in cabbage according to field experiment data.Fortified and recovered experiment: The recoveries were ranged from 83.28% to 110.21%, the coefficient variation ranged from 3.59%~6.25%, the analysis is simple quickly, sensitive and accurately,.Residual dynamics experiment: the half-life of triazopho EC (360mg/kg) spray in the soil is 8.2 days and 6.3 days respectively, and is 4.2 days and 3.3 days in cabbage respectively, the rule of eliminating conform Kinetic model.Residual experiment: After 7th day, 14th day and 21st day, the residual data of 20% triazopho EC under 240mg/kg and 360mg/kg sprayed 2 times and 3 times respectively are following: spraying by 360mg/kg 2 times or 3 times, the residual ranged from 0.08~3.24 mg/kg in cabbage, and ranged from 0.012-0.072 mg/kg in soil. After 14 days, the residual of triazopho in cabbage is above 0.2 mg/kg. and spraying by 240mg/kg 2 times or 3 times, the residual ranged from 0.08-1.97 mg/kg in cabbage, and ranged from 0.01-0.068 mg/kg in soil. After 14 days, the residual of triazopho in cabbage is above 0.2 mg/kg too.According to these data the residual in plant is above soil, the high of the concentration in usage and the more times of applying, the residual are more high. The result indicated that the MRL of triazopho in pearl is 0.2mg/kg from last application, the MRL of triazopho is temporarily suggested to be 0.2 mg/kg. the application rules are followed: in the cabbage growth period, the usage of triazopho shouldn't be above 2 times and the most high concentration should be 240mg/kg, the safe interval period should be 21 days.