Peng Liying, Hua Lei, Wang Weiguo, Zhou Qinghua, Li Haiyang
1] Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, People's Republic of China [2] University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, People's Republic of China.
Sci Rep. 2014 Oct 16;4:6631. doi: 10.1038/srep06631.
New techniques for the field detection of inorganic improvised explosive devices (IEDs) are urgently developed. Although ion mobility spectrometry (IMS) has been proved to be the most effective method for screening organic explosives, it still faces a major challenge to detect inorganic explosives owing to their low volatilities. Herein, we proposed a strategy for detecting trace inorganic explosives by thermal desorption ion mobility spectrometry (TD-IMS) with sample-to-sample analysis time less than 5 s based on in-situ acidification on the sampling swabs. The responses for typical oxidizers in inorganic explosives, such as KNO3, KClO3 and KClO4 were at least enhanced by a factor of 3000 and their limits of detection were found to be subnanogram. The common organic explosives and their mixtures with inorganic oxidizers were detected, indicating that the acidification process did not affect the detection of organic explosives. Moreover, the typical inorganic explosives such as black powders, firecrackers and match head could be sensitively detected as well. These results demonstrated that this method could be easily employed in the current deployed IMS for on-site sensitive detection of either inorganic explosives or organic ones.
迫切需要开发用于现场检测无机简易爆炸装置（IED）的新技术。尽管离子迁移谱（IMS）已被证明是筛选有机炸药最有效的方法，但由于无机炸药挥发性低，检测它们仍然面临重大挑战。在此，我们提出了一种基于采样拭子原位酸化的热解吸离子迁移谱（TD-IMS）检测痕量无机炸药的策略，样品间分析时间小于5秒。无机炸药中典型氧化剂（如KNO3、KClO3和KClO4）的响应至少增强了3000倍，检测限达到亚纳克级。该方法能够检测常见有机炸药及其与无机氧化剂的混合物，表明酸化过程不影响有机炸药的检测。此外，典型的无机炸药如黑火药、鞭炮和火柴头也能被灵敏检测。这些结果表明，该方法可轻松应用于当前部署的IMS，用于现场灵敏检测无机炸药或有机炸药。
