Degradation of the Neonicotinoid Pesticides in the Atmospheric Pressure Ionization Source

文献类型： 外文期刊

第一作者： Chai, Yunfeng

作者： Chai, Yunfeng;Chen, Hongping;Liu, Xin;Lu, Chengyin;Chai, Yunfeng;Chen, Hongping;Liu, Xin;Lu, Chengyin;Chai, Yunfeng;Chen, Hongping;Liu, Xin;Lu, Chengyin

作者机构：

关键词： Neonicotinoid pesticide;Degradation;Atmospheric pressure ionization;In-source ion/molecule reaction

期刊名称：JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY （ 影响因子：3.109； 五年影响因子：3.323 ）

ISSN： 1044-0305

年卷期： 2018 年 29 卷 2 期

页码：

收录情况： SCI

摘要： During the analysis of neonicotinoid pesticide standards (thiamethoxam, clothianidin, imidacloprid, acetamiprid, and thiacloprid) by mass spectrometry, the degradation of these pesticides (M-C=N-R is degraded into M-C=O, M is the skeleton moiety, and R is NO2 or CN) was observed in the atmospheric pressure ionization interfaces (ESI and APCI). In APCI, the degradation of all the five neonicotinoid pesticides studied took place, and the primary mechanism was in-source ion/molecule reaction, in which a molecule of water (confirmed by use of H-2 O-18) attacked the carbon of the imine group accompanying with loss of NH2R (R=NO2, CN). For the nitroguanidine neonicotinoid pesticides (R=NO2, including thiamethoxam, clothianidin, and imidacloprid), higher auxiliary gas heater temperature also contributed to their degradation in APCI due to in-source pyrolysis. The degradation of the five neonicotinoid pesticides studied in ESI was not significant. In ESI, only the nitroguanidine neonicotinoid pesticides could generate the degradation products through in-source fragmentation mechanism. The degradation of cyanoamidine neonicotinoid pesticides (R=CN, including acetamiprid and thiacloprid) in ESI was not observed. The degradation of neonicotinoid pesticides in the ion source of mass spectrometer renders some adverse consequences, such as difficulty interpreting the full-scan mass spectrum, reducing the sensitivity and accuracy of quantitative analysis, and misleading whether these pesticides have degraded in the real samples. Therefore, a clear understanding of these unusual degradation reactions should facilitate the analysis of neonicotinoid pesticides by atmospheric pressure ionization mass spectrometry.

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