A gas chromatographic method for the determination of prochloraz and its metabolite 2,4,6-trichlorophenol in yam was established.Yam was extracted with acetone and n-hexane(1+1)and then hydrolyzed with pyridine hydrochloride at(220±10)℃,extracted with petroleum ether(Ⅰ),purified with concentrated sulfuric acid,and then determined by machine.The linear range of the method was 0.5～10.0 μg·mL-1,the minimum detection concentration was 0.005 mg·kg-1,and the recovery was 82.0%～91.6%at the low,medium and high spiked levels,with the relative standard deviation of 1.5%.The method was rapid,safe and suitable for the determination of prochloraz residues in yam in batches.
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