Detect the method for oxamyl and oxamyl oxime residual quantity in vegetables/fruit simultaneously

The invention discloses a kind of method that simultaneously detects oxamyl and oxamyl oxime residual quantity in vegetables/fruit, step is as follows: extract (1): get vegetables/fruit sample to be detected, add acetonitrile, NaCl, homogenate, centrifugal; (2) purify: get upper strata acetonitrile phase, be placed in the centrifuge tube that Dispersive solid phase extraction agent is housed, centrifugal, get supernatant, nitrogen dries up, mobile phase constant volume, cross 0.22 μm of organic system filter membrane, obtain sample liquid; (3) mensuration and result calculating: adopt liquid chromatography mass/GC-MS to detect sample liquid, record the chromatographic peak area of oxamyl or oxamyl oxime, put into calibration curve, calculate oxamyl or oxamyl oxime content in sample liquid. The present invention utilizes dispersive solid-phase extraction technology, establish easy, sample-pretreating method fast, the detection limit of oxamyl and oxamyl oxime is respectively 0.002mg/kg and 0.001mg/kg, has easy and simple to handle, quick, accurate, highly sensitive and reproducible advantage.