Simplified Screening Analysis for Pesticide Residues in Farm Products by Ultrasonic Extraction

We examined the ultrasonic extraction of pesticide residues on strawberries with hexane, acetone, methanol and acetonitrile for extractants. The results showed that analytical values of highly lipophilic pesticides such as diethofencarb, chlorfenapyr and pyridalyl by using the ultrasonic extraction were nearly same as those by the notified analytical method for pesticide residues in farm products. In particular, impurities in hexane solution extracted by ultrasonic wave without further purification were less than those in solution purified by the notified analytical method, indicating the simplified operation in purification process.