An ultra performance liquid chromatography-tandem mass spectrometric（UPLC-MS/MS) method was developed for the determination of carbofuran and aldicarb

as well as their metabolites carbofuran 3-hydroxy

aldicarb sulfone and aldicarb sulfoxide in cucumber

tomato and cowpea.The samples were extracted with acetonitrile and QuEChERS salt packets containing 0.5 g sodium sesquihydrate

1 g sodium citrate

1 g NaCl and 4 g MgSO4

and purified by pass through solid phase extraction using an Oasis PRiME HLB column

then analyzed by UPLC-MS/MS.The matrix effects were observed in the analysis of the analytes in sample.The quantitations were performed by the external standard method with matrix matched calibration standards.There were linear relationships for carbofuran

carbofuran 3 hydroxy

aldicarb

aldicarb sulfone and aldicarb sulfoxide in the range of 0.001-0.5 mg/L with their correlation coefficients（r) larger than 0.996 0.Recoveries for cucumber

tomato and cowpea at spiked levels of 0.02-0.2 mg/kg ranged from 80.4% to 110%

with relative standard deviations（RSDs) of 1.1%-4.8%.The limits of detection（LOD

S/N=3) for carbofuran

carbofuran 3-hydroxy

aldicarb

aldicarb sulfone and aldicarb sulfoxide were 0.07

0.3

1.0

4.0 and 13 μg/kg

respectively

and the limits of quantitation（LOQ

S/N=10) were 0.2

1.0

2.0

13 and 42 μg/kg

respectively