Sensitive Detection of Black Powder by a Stand-Alone Ion Mobility Spectrometer with an Embedded Titration Region
Sensitive Detection of Black Powder by a Stand-Alone Ion Mobility Spectrometer with an Embedded Titration Region
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通过具有嵌入式滴定区的独立离子淌度谱仪对黑粉末进行灵敏检测
DOI：
10.1021/ac400337s
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发表时间：
2013-05-21
影响因子：
7.4
通讯作者：
Li, Haiyang
中科院分区：
文献类型：
--
作者：
Liang, Xixi;Zhou, Qinghua;Li, Haiyang
采用独立离子迁移谱仪（IMS）对黑火药（BP）进行灵敏检测是一项充满挑战的工作。在传统的空气基IMS中，反应物离子O-2（-）（H2O）（n）峰和硫离子峰之间严重重叠;并且提供替代反应物离子Cl-（H2O）（n）的常见掺杂方法将阻碍离子硫同素异形体的形成。在这项工作中，离子迁移谱仪嵌入一个滴定区下游的电离区（TR-IMS）开发的选择性和灵敏度检测BP中的硫与CH 2Cl 2作为滴定试剂。硫的在电离区，硫分子与O-2（-）（H2O）（n）离子反应生成Cl-（H2O）（n）离子，其余进入滴定区的O-2（-）（H2O）（n）离子转化为Cl-（H2O）（n）离子，避免了峰的重叠和CH 2Cl 2对硫离子的负作用。硫的检测限测得为5 pg。此外，它被证明，这TR-IMS是合格的检测小于5纳克的BP和其他硝基有机炸药。
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 O-2(-)(H2O)(n) peak and the sulfur ion peak occurs severely; and common doping methods, providing alternative reactant ion Cl-(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 O-2(-)(H2O)(n) ions in the ionization region, and the remaining O-2(-)(H2O)(n) ions that entered the titration region were converted to Cl-(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.