Abstract
A modified Luke rapid detection method followed by gas chromatography–mass spectrometry (GC–MS) has been developed for the simultaneous determination of 42 pesticides in ginseng tea. This method uses acetone and n-hexane solution to extract and partition pesticides. Ginseng tea samples were mixed with acetone, water and n-hexane solution, and then partitioned by vortex. After the partition, the top layer (n-hexane) was transferred into a centrifuge tube containing primary secondary amine (PSA), graphitized carbon black (GCB) and C18 for purification. And then the centrifuge supernatant was injected into GC–MS. The Luke method was applied in ginseng tea sample detection, and we confirmed that this method can easily extract various types of pesticides from ginseng tea samples. The rates of recovery for pesticides studied were satisfactory, ranging from 65.5 to 109.0 % with a relative standard deviation (RSD) of less than 12 %. The limits of quantification (LOQs) ranged between 0.5 and 11.5 μg·kg−1. The modified Luke method is quick and easy.
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