Citation:
LIANG Hua-Zheng, YANG Shui-Ping, HUAN Yan-Fu, ZHANG Xie, CHEN Huan-Wen, LIU Qing, LIU Qing-Jun, ZHENG Jian. Determination of Carbamate Pesticides in Vegetables by Surface Desorption Atomospheric Pressure Chemical Ionization Mass Spectrometry[J]. Chinese Journal of Applied Chemistry,
;2009, 26(10): 1222-1226.
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Surface desorption atmospheric chemical ionization mass spectrometry(SDAPCI-MS) was used to directly determine pesticide residue on the surface of vegetables without any toxic chemical contamination. Three carbamate pesticides,carbofuran,isoprocarb and methomyl,were determined,and the structure of the molecular ions of each analyte was confirmed by collision-induced dissociation(CID) to exclude the fake positive conclusion. The results show that the carbofuran and methomyl exhibit protonated molecular ion signals at m/z 222 and m/z 163 respectively,but the isoprocarb displays free radical cation signal at m/z 193 under these conditions. The tandem mass spectrometry shows that the fragmentation regularity of the three carbamate pesticides coincide with their molecular structures. The detection limit of this method was found to be less than 1.0×-14g/cm2,and the detection time less than 1 s. SDAPCI-MS is a good method to inspect bulk samples nondestructively without sample pretreatment.
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