Sensitive Detection of Black Powder by a Stand-Alone Ion Mobility Spectrometer with an Embedded Titration Region

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• 作者：Xixi Liang ; Qinghua Zhou ; Weiguo Wang ; Xin Wang ; Wendong Chen ; Chuang Chen ; Yang Li ; Keyong Hou ; Jinghua Li ; Haiyang Li
• 刊名：Analytical Chemistry
• 出版年：2013
• 出版时间：May 21, 2013
• 年：2013
• 卷：85
• 期：10
• 页码：4849-4852
• 全文大小：330K
• 年卷期：v.85,no.10(May 21, 2013)
• ISSN：1520-6882

文摘

Sensitive detection of black powder (BP) by stand-alone ion mobility spectrometry (IMS) is full of challenges. In conventional air-based IMS, overlap between the reactant ion O₂^{鈥?/sup>(H₂O)_n peak and the sulfur ion peak occurs severely; and common doping methods, providing alternative reactant ion Cl鈥?/sup>(H₂O)_n, would hinder the formation of ionic sulfur allotropes. In this work, an ion mobility spectrometer embedded with a titration region (TR-IMS) downstream from the ionization region was developed for selective and sensitive detection of sulfur in BP with CH₂Cl₂ as the titration reagent. Sulfur ions were produced via reactions between sulfur molecules and O₂鈥?/sup>(H₂O)_n ions in the ionization region, and the remaining O₂鈥?/sup>(H₂O)_n ions that entered the titration region were converted to Cl鈥?/sup>(H₂O)_n ions, which avoided the peak overlap as well as the negative effect of CH₂Cl₂ on sulfur ions. The limit of detection for sulfur was measured to be 5 pg. Furthermore, it was demonstrated that this TR-IMS was qualified for detecting less than 5 ng of BP and other nitro-organic explosives.}