In order to evaluate the safety of imidacloprid pesticide residues in wheat,the digestion dynamic and residues dynamic law of imidacloprid in wheat plants in Hunan and Jilin areas were studied with the method of HPLC.The samples with acetonitrile were extracted by constant temperature oscillator,the extracting solution was extracted with petroleum ether to remove impurities and then extracted with dichloromethane,which was purified by Florisil-activated carbon column and detected by HPLC-UVD.The results showed that the spiked recoveries in grain and straw at 0.02,0.05 and 0.25 mg · kg-1 levels were 82.17 ％-103.84 ％,83.82 ％-111.39 ％,respectively,and the coefficients of variation were 4.30 ％-6.82 ％,2.30 ％-5.98 ％.Imidacloprid in wheat straw samples of Hunan and Jilin areas were both digested faster,the half-life were 4.53,2.99 days.The recommended dose of 225 g · hm-2and high-doee 337 g· hm-2 imidacloprid were applied twice and three times at interval of 7 days,the final maximum residue of imidacloprid in wheat grain and wheat straw harvested after 7 and 14 days were 0.0291 and 0.1077 mg· kg-1.Referring to the United States MRL(wheat 0.05 mg· kg-1,wheat straw feed 0.5 mg· kg-1),at present harvested grain consumption was relatively safe,and wheat straw could also be used as feed safety.
ImidaclopridWheat grainWheat plantsHPLCResidue dynamicsResidual law
NETL
NSTL
万方数据
维普
