A method for the determination of metaldehyde residues in patchouly was developed by GC-MS/MS.The crushed samples were extracted with acetic acid 1％aqueous solution and acetonitrile(volume ratio of 10:15),purified by HLB SPE column,performed on DB-5MS column,and quantified by external standard method.The results showed that at the concentration of 0.01-1.00 mg/L,the linear relationship was good,and the correlation coefficient was 0.999 7.At the concentration of 0.006-0.060 mg/kg,the average recoveries were 88.13％-93.35％,the relative standard deviation ranged from 0.81％to 2.19％(n=6).The limit of detection(LOD)and the limit of quantification(LOQ)were 0.002 mg/kg and 0.006 mg/kg,respectively.The method was simple,rapid,sensitive,and suitable for the deteremination of metaldehyde residues in patchouly.
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