This study was carried out in order to establish a multiresidue analysis method applicable to the Positive List System (PLS) in Korea. A simple, sensitive, and selective method using liquid chromatography-tandem mass spectrometry (LC/MS/MS) has been developed to detect 88 pesticides in brown rice and orange. Samples were prepared using acetonitrile saturated with sodium chloride, followed by solid phase dispersive clean up. The quantification was done with matrix-matched calibration curves. The limits of quantification were in the range 0.0003-0.03 mg/kg and the limits of detection were between 0.0001 and 0.01 mg/kg. The recoveries at 0.02 and 0.1 mg/kg were within 70-120% (n=6) associated relative standard deviations < 25%. Based on these results, this multiresidue analysis method has been proven to be a highly efficient, robust, and accurate approach suitable for the monitoring of LC-amenable pesticides in accordance with PLS requirements. This method can surely be used as the official method for monitoring pesticides applicable to the PLS of imported agricultural products in Korea.

Multiresidue analysis of pesticides in brown rice and orange by liquid chromatography-tandem mass spectrometry

246th National Meeting (2013)

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