CAJ | 학술논문

采用自行研制的表面解吸常压化学电离源(SDAPCI),样品未经预处理用质谱法直接测定了克百威、灭多威和异丙威3种氨基甲酸酯农药在蔬菜表面的残留,并用串联质谱法对所获得的信号离子进行结构鉴定,排除了检测结果的假阳性. 结果表明,克百威和灭多威分别形成m/z 222和m/z 163的质子化的分子离子信号,异丙威形成m/z 193的自由基阳离子信号. 串联质谱实验表明,3种氨基甲酸酯农药分子的裂解规律与其分子结构相吻合. 表面解吸常压化学电离质谱法对待测样品无污染,方法检测限低于1.0×10~(-14) g/cm~2,单个样品的测定时间平均少于1 s,特别适合于对批量样品进行快速检测.
채용자행연제적표면해흡상압화학전리원(SDAPCI),양품미경예처리용질보법직접측정료극백위、멸다위화이병위3충안기갑산지농약재소채표면적잔류,병용천련질보법대소획득적신호리자진행결구감정,배제료검측결과적가양성. 결과표명,극백위화멸다위분별형성m/z 222화m/z 163적질자화적분자리자신호,이병위형성m/z 193적자유기양리자신호. 천련질보실험표명,3충안기갑산지농약분자적렬해규률여기분자결구상문합. 표면해흡상압화학전리질보법대대측양품무오염,방법검측한저우1.0×10~(-14) g/cm~2,단개양품적측정시간평균소우1 s,특별괄합우대비량양품진행쾌속검측.
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 1.0×10~-14 g/cm~2, and the detection time less than 1 s. SDAPCI-MS is a good method to inspect bulk samples nondestructively without sample pretreatment.