粗径毛细管气相色谱法测定F8426在土壤和小麦中的残留量

Determination of Carfentrazone-Ethyl(F8426) Residue in Soil and Wheat by Wide-Bore Capillary Gas Chromatography

用气相色谱法测定了快灭灵 40 %干悬浮剂中F842 6在土壤和小麦中的残留量。用丙酮 水 (体积比为 80∶2 0 )溶液提取土壤和小麦样本中的F842 6 ,然后用石油醚萃取。石油醚相经浓缩后过弗罗里硅土和活性炭 (0 97g +0 0 3g)混合小柱净化 ,再用OV 170 1粗径毛细管柱分离 ,用电子捕获检测器 (ECD)测定。该方法对F842 6的最小检出量为 0 0 2ng ,在小麦和土壤中F842 6的最低检出限分别为 2 μg/kg和 1μg/kg ,对土壤和小麦空白样本的平均添加回收率为 89 6 0 %～ 97 5 3%,变异系数为 4 42 %～ 8 6 7%。该方法可用于F842 6的残留量分析 ,并为其他新型芳基三唑酮类化合物的分离分析提供了参考依据 。

An efficient method for determining F8426 of Affinity 40 DF in soil and wheat is described F8426 was extracted from the soil and the wheat sample with acetone water (80∶20, volume ratio), and the extract was partitioned with petroleum ether Then the upper layer was concentrated and cleaned up on a micro column of Florisil and activated carbon mixture Finally F8426 was separated from other interfering components through wide bore capillary gas chromatographic column(OV 1701, 12 m×0 53 mm i d ), and was detected by electron capture detector (ECD) The lowest detection limit for F8426 was 0 02 ng The lowest detectable concentrations in wheat and soil was 2 μg/kg and 1 μg/kg respectively The average recovery and coefficient of variation of this method were 89 60% 97 53% and 4 42% 8 67% respectively This method is simple, sensitive and suitable for residue analysis of F8426