粗径毛细管气相色谱法测定F8426在土壤和小麦中的残留量

 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%。。

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

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 x 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 micrograms/kg and 1 microgram/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.