Azocyclotin And Soil In Citrus Comparison Of Residue Analysis And Degradation

Azocyclotin is a tag of acaricides can be mixed with other pesticides in order to expand the scope of control, persistence length. Against apple red spider, red spider young hawthorn concentration of 167～250ml/L, the effective control of citrus red mite concentration of 250ml/L.Interval of 15 days. In order to understand Azocyclotin use, and the environment in the citrus residue, to evaluate the safety, for the rational use of pesticides, supervision of agricultural production to ensure quality and safety and environmental safety of agricultural products to provide evidence. This article Azocyclotin and environment in the citrus residue analysis methods and degradation dynamics were studied.Azocyclotin residue analysis method:the orange and soil as experimental material, after four different conditions of pre-treatment, respectively, in four different configurations were analyzed on the instrument, the results showed that the Agilent GC-6890N, with FPD (S) detector on the minimum detectable amount was 10.0 x 10-9 g, recovery 84.92%～124.03%, coefficient of variation was 0.78%～3.42%; in the Agilent 6890-plus with a FPD detector (with tin filter) on the minimum detectable amount was 5.0 x 10-9g, orange recovery 87.5%～113.8%, coefficient of variation of 5.9%～9.4%; soil recovery was 77.5%～97.0%, coefficient of variation was 6.0% 7.7%; in Diane P680HPLC Pump liquid chromatography with DAD detector, the minimum detectable amount was 2.0 x 10-9g, the average recovery rate of 80.5 to 94.1%, coefficient of variation was 2.11～4.96%; in the high performance liquid chromatography PDA diode array detector with the smallest detectable amount of 2.0×10-9g, recovery of 71.3%～75.2%, coefficient of variation was 1.07%～3.96%.In summary Azocyclotin four different instruments in the method of residue analysis, in addition to the island azocyclotin fluid phase chromatography with diode array detector PDA on the low recovery rate, the other three residues approach is consistent with residues requirements. By comparison of sample preparation methods that:azocyclotin the Agilent 6890-plus with FPD (with tin-filter) detector on the residue analysis of pre-treatment process more simple and can effectively save the testing cost and improve the detection efficiency.A field experiment showed that azocyclotin residues in citrus soil degradation dynamics for different test environment there are some differences:①million in Wangcheng County orchards in the citrus Azocyclotin by y=1.383e-in 0.3022t (R2= 0.9946) the degradation half-life of 2.3 days; azocyclotin in the soil by y= 3.5787e-0.1339t (R2=0.9756) the degradation half-life of 5.2 days;②citrus of Jiande City, Zhejiang Province the citrus orchard, in the orange Azocyclotin by y= 4.0262e-0.1369t (R2=0.8604) degradation half-life of 9.4 days; azocyclotin in the soil by y=2.4693e-0.1207t (R2=0.7716) degradation, half-life of 6.6 days;③Huizhou City in Guangdong Province, in the orange Azocyclotin by y=0.1801e-0.7264t (R2= 0.9943) the degradation half-life of 4.8 days; in the soil by y=0.1028e-0.9096t (R2= 0.9851) the degradation half-life of 6.1 days.The results showed that the final residue:10% Azocyclotin EC 500 times and 1,000 times, application number 1 and 2, from the harvest 30 days after the final residue Azocyclotin low consumption of citrus safer and less pollution of the soil. Application rate and spraying with the increase in the number of residual increase was not significant.