茚嗪氟草胺及其代谢物在柑橘和土壤中的残留及消解动态

为明确茚嗪氟草胺及其代谢物indaziflam-diaminotriazine(IND-D),indaziflam-carboxylic acid(IND-C),indaziflam-triazine-indanone(IND-T),indaziflam-hydroxyethyl(IND-H),indaziflam-olefin(IND-O)在柑橘和土壤中的残留消解动态及最终残留,样品采用乙腈提取,二氯甲烷净化,液相色谱串联质谱法(LC-MS/MS)检测。茚嗪氟草胺,IND-C,IND-T,IND-H和IND-O在柑橘(果皮、果肉、全果)和土壤中的最低检测浓度(LOQ)为0.01 mg/kg,IND-D的LOQ为0.02 mg/kg。残留消解动态试验结果表明,茚嗪氟草胺在柑橘园土壤中的半衰期为15.07~16.12 d,在柑橘中的残留量低于LOQ,其代谢物在柑橘和土壤中的残留量皆低于LOQ。最终残留试验结果表明,500 g/L茚嗪氟草胺悬浮剂分别按有效成分用量100 g/hm 2和150 g/hm 2于杂草出苗前定向封闭施药1次,柑橘收获期(药后86 d)茚嗪氟草胺及其代谢物在柑橘和土壤中的残留量皆低于LOQ。

Residues and dissipation dynamic of indaziflam and its metabolites in orange and soil

In order to determine the dissipation dynamic and final residues of indaziflam 500 g/L SC and its metabolites,including indaziflam-diaminotriazine(IND-D),indaziflam-carboxylic acid(IND-C),indaziflam-triazine-indanone(IND-T),indaziflam-hydroxyethyl(IND-H)and indaziflam-olefin(IND-O),in orange(peel,flesh,whole fruit)and soil,the samples were extracted by acetonitrile,purified by dichloromethane,and detected by liquid chromatography-mass spectrometry(LC-MS/MS).The limits of quantitation(LOQs)of indaziflam,IND-C,IND-T,IND-H and IND-O in the peel,flesh,whole fruit of orange and soil were 0.01 mg/kg and that of IND-D was 0.02 mg/kg.Digestion dynamic analysis showed that the half-life of indaziflam in soil was 15.07-16.12 d.However,the residues of indaziflam’s metabolites in the peel,flesh,whole fruit and soil were below their corresponding LOQs.Under the application of indaziflam at 100 g/hm 2 and 150 g/hm 2 in the soil at the weed pre-emergence period,the final residues of indaziflam and its metabolites in orange and soil were below their corresponding LOQs when the orange was ripe and harvested(86 d after treatment).