The Deltamethrin residues were extracted with acetone-petroleum ether,purified by chromatography on anhydrous sodium sulfate aluminum oxide neutral, and determined by GC-ECD.

• 样品用丙酮--石油醚提取，无水硫酸钠--中性氧化铝柱净化后，用带ECD的气相色谱仪进行检测。