气相色谱-串联质谱方法测定小麦中唑草酮的残留及消解动态

Degradation of carfentrazone-ethyl in wheat plants using GC-MS/MS

采用田间试验方法研究唑草酮在小麦中的残留动态,建立了气相色谱-串联质谱(GC-MS/MS)测定唑草酮在小麦植株与麦粒上的残留分析方法。唑草酮在小麦植株中的平均回收率为99.4%～102.2%,变异系数为3.0%～6.5%;在麦粒中平均回收率为88.3%～90.6%,变异系数为2.8%～8.9%。动态结果表明:在小麦上使用唑草酮后,利用该方法检测唑草酮在山东和河南两地小麦植株中的残留消解半衰期分别为3.50d和3.67d;收获期唑草酮在麦粒中最终残留量均小于0.01mg/kg。

A sensitive and effective method for determination of carfentrazone-ethyl residue in wheat plants was developed using gas chromatography coupled with tandem mass spectrometry（GC-MS/MS）.The average recovery of carfentrazone-ethyl following the analytical procedure ranged between 99.4% and 102.2% for wheat plants,and between 88.3% and 90.6% for wheat,with the variation coefficients of 3.0%-6.5% and 2.8%-8.9%,respectively.A field experiment was conducted to reveal dynamics of carfentrazone-ethyl degradation in wheat plants.When wheat was sprayed with carfentrazone-ethyl,the field experiment results showed that the half life of carfentrazone-ethyl was 3.50 d and 3.67 d in Shandong and Henan.The final residues of carfentrazone-ethyl in wheat plants was lower than 0.01 mg/kg.