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Trace level detection and identification of tabun in aqueous media by derivatization and liquid chromatography tandem mass spectrometry analysis
International Journal of Mass Spectrometry ( IF 1.8 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.ijms.2020.116393
Moran Madmon , Avi Weissberg

Abstract A highly sensitive method for the detection and identification of the G-nerve agent tabun (GA) was developed. 2-[(Dimethylamino)methyl]phenol (2-DMAMP), which was recently developed for the derivatization of GB, GD and GF, was also found to be efficient for the derivatization of GA. The optimized derivatization procedure in an aqueous medium was the addition of 2-DMAMP followed by 5 min of stirring at ambient temperature and subsequent LC-ESI(+)-MS/MS analysis. Derivatized GA was more stable than intact GA, and with detection nearly two orders of magnitude more sensitive. Its ESI-MS/MS spectrum shows two major product ions at m/z 242 and m/z 214. The developed method is more sensitive than any other LC-MS or GC-MS-based method and clearly demonstrates the new concept of “freezing the clock” for determining reactive GA in an aqueous medium, with a limit of detection (LOD) of 10 pg/mL in drinking water. The derivatization reaction efficiencies were evaluated with aqueous extracts of soil, asphalt, cloth, formica and linoleum spiked with GA and found to be similar to that with drinking water. The method was also found to be useful for enhancing the sensitivity of the detection method for other members of the GA family, namely, the GA hydrolysis product (O-ethyl phosphorylcyanidate) obtained under acidic conditions and the diethylamino analog of GA, which both possess a good leaving group (e.g., CN−). The method is appropriate for routine use for verification and evaluation of contamination in cases where trace level detection is required.

中文翻译:

衍生化和液相色谱串联质谱分析法对水性介质中塔崩的痕量检测和鉴定

摘要 开发了一种用于检测和鉴定G神经毒剂塔崩(GA)的高灵敏度方法。2-[(二甲基氨基)甲基]苯酚 (2-DMAMP),最近开发用于衍生 GB、GD 和 GF,也被发现对 GA 的衍生化是有效的。在水性介质中优化的衍生化程序是添加 2-DMAMP,然后在环境温度下搅拌 5 分钟,然后进行 LC-ESI(+)-MS/MS 分析。衍生的 GA 比完整的 GA 更稳定,检测灵敏度高近两个数量级。其 ESI-MS/MS 谱图显示 m/z 242 和 m/z 214 处的两个主要产物离子。开发的方法比任何其他基于 LC-MS 或 GC-MS 的方法更灵敏,并清楚地展示了“冻结时钟”用于确定水性介质中的活性 GA,饮用水中的检测限 (LOD) 为 10 pg/mL。衍生化反应效率通过土壤、沥青、布料、胶木和油毡的水提取物加 GA 进行评估,发现与饮用水相似。该方法还被发现可用于提高 GA 家族其他成员的检测方法的灵敏度,即在酸性条件下获得的 GA 水解产物(O-乙基磷酸氰)和 GA 的二乙氨基类似物,它们都具有一个好的离去基团(例如,CN-)。在需要痕量检测的情况下,该方法适用于常规用于验证和评估污染。沥青、布、胶木和油毡加标了 GA,发现与饮用水相似。该方法还被发现可用于提高 GA 家族其他成员的检测方法的灵敏度,即在酸性条件下获得的 GA 水解产物(O-乙基磷酸氰)和 GA 的二乙氨基类似物,它们都具有一个好的离去基团(例如,CN-)。在需要痕量检测的情况下,该方法适用于常规用于验证和评估污染。沥青、布、胶木和油毡加标了 GA,发现与饮用水相似。该方法还被发现可用于提高 GA 家族其他成员的检测方法的灵敏度,即在酸性条件下获得的 GA 水解产物(O-乙基磷酸氰)和 GA 的二乙氨基类似物,它们都具有一个好的离去基团(例如,CN-)。在需要痕量检测的情况下,该方法适用于常规用于验证和评估污染。在酸性条件下获得的 GA 水解产物(O-乙基磷酰氰)和 GA 的二乙氨基类似物,它们都具有良好的离去基团(例如,CN-)。在需要痕量检测的情况下,该方法适用于常规用于验证和评估污染。在酸性条件下获得的 GA 水解产物(O-乙基磷酰氰)和 GA 的二乙氨基类似物,它们都具有良好的离去基团(例如,CN-)。在需要痕量检测的情况下,该方法适用于常规用于验证和评估污染。
更新日期:2020-10-01
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