Residue Analysis Of Pyridaben In Cucumber, B-azolemiteacrylic In Cotton And Their Planting Soil

Food, clothing, shelter [housing] and transportation are basic necessities of life. Especially in recent years, frequent media exposure of a series of excessive pesticide residues on food. Pesticide residue problem has become an important part of the food safety. Control of pesticide residues in agricultural products in a safe range, guiding farmers to use pesticides, controling pesticide usage and recovery interval have been realized by more and more people. At the same time, the use of pesticides also makes the environment pollution problem increasingly prominent.This paper choose the cucumber and cotton as reaserch samples. Analysing the Pyridaben smoke agent residue in cucumber and soil and B-azolemiteacrylic suspending agent in cotton and the dynamic and residues in the soil. In addition, the effect of pesticide on soil was researched.Gas chromatography was used to analyse the residue of Pyridaben in cucumber and soil, three levels (0.010,0.10,1.0 mg/kg) Pyridaben was added to the blank samples of cucumber, the average recovery was in the range of 89% to 109%, relative standard deviation was 1.0%～4.7%; average recovery of soil samples was 83～92%, relative standard deviation was 1.3%～2.6%.This method has good sensitivity and accuracy.The content of B-azolemiteacrylic in cotton and soil was studied in liquid chromatography-tandem mass spectrometry method. The results show that three concentrations (0.010,0.10,0.50 mg/kg) were added in the blank samples of cotton leaf, the average recovery was 86～90%, relative standard deviation was 7.5%～ 12.8%; the average recovery of soil samples was 81～103%, relative standard deviation was 6.7%～10.1%; the average recovery of cotton seed samples was 79～ 91%, relative standard deviation was 3.5%～6.3%. The sensitivity, accuracy of the method are all very well.The experiment on Pyridaben smoke agent was performed in three provinces (shandong, hebei, anhui) for two years. The results show that the primitive accumulation of Pyridaben smoke agent on cucumber is very low, the content of Pyridaben residue in most of the sampling time points are< 0.01 mg/kg. The content of Pyridaben residue in cucumber which collected in the next days after applying pesticide experiments were lower than the value of Japan, the European Union, Canada regulations on cucumber Pyridaben maximum limits residue. So the requirements of Pyridaben smoke agent for farmers is not too high, shorten the recovery interval, it is safe to eat the cucumbers which harvest in the next day after applying pesticide.The experiment on B-azolemiteacrylic in cotton and soil were performed in Shandong and Anhui provinces for two years. The results shown that 30% B-azolemiteacrylic suspending agent was used to cure leaf mites in the leaves of cotton, degradation in cotton leaf has a half-life of 1.5-7.0days, degradation in soil has a half-life of 3.0-12.0 days, that suggesting that B-azolemiteacrylic belongs to easier degrade pesticide in cotton leaves and soil. The final residual test showed that the content of B-azolemiteacrylic residues in cotton seed which harvested after 21 and 28 days applying pesticide was<0.01 mg/kg. So B-azolemiteacrylic 21 days after applying pesticide, seeds harvested using is safe Therefore, it is safe to use and eat the cotton seed which harvest in the next 21 day after applying pesticide.