Analysis of explosives using corona discharge ionization combined with ion mobility spectrometry-mass spectrometry

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• 作者：Jihyeon Lee ; Sehwan Park ; Soo Gyeong Cho ; Eun Mee Goh ; Sungman Lee ; Sung-Suk Koh ; Jeongkwon Kim
• 关键词：Explosives ; Corona discharge ionization ; Ion mobility spectrometry ; Mass spectrometry
• 刊名：Talanta
• 出版年：March, 2014
• 年：2014
• 卷：120
• 期：Complete
• 页码：64-70
• 全文大小：875 K

文摘

Corona discharge ionization combined with ion mobility spectrometry-mass spectrometry (IMS-MS) was utilized to investigate five common explosives: cyclonite (RDX), trinitrotoluene (TNT), pentaerythritol tetranitrate (PETN), cyclotetramethylenetetranitramine (HMX), and 2,4-dinitrotoluene (DNT). The MS scan and the selected ion IMS analyses confirmed the identities of the existing ion species and their drift times. The ions observed were RDX路NO₃^{鈭?/sup>, TNT鈭?/sup>, PETN路NO₃鈭?/sup>, HMX路NO₃鈭?/sup>, and DNT鈭?/sup>, with average drift times of 6.93 ms, 10.20 ms, 9.15 ms, 12.24 ms, 11.30 ms, and 8.89 ms, respectively. The reduced ion mobility values, determined from a standard curve calculated by linear regression of (normalized drift times)鈭? versus literature K₀ values, were 2.09, 1.38, 1.55, 1.15, 1.25, and 1.60 cm2 V鈭? s鈭?, respectively. The detection limits were found to be 0.1 ng for RDX, 10 ng for TNT, 0.5 ng for PETN, 5.0 ng for HMX, and 10 ng for DNT. Simplified chromatograms were observed when nitrogen, as opposed to air, was used as the drift gas, but the detection limits were approximately 10 times worse (i.e., less sensitivity of detection).}