DeGreeff Lauryn, Rogers Duane A, Katilie Christopher, Johnson Kevin, Rose-Pehrsson Susan
Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC, United States.
Former Employee, Naval Research Laboratory, 4555 Overlook Ave. SW, Washington, DC, United States.
Forensic Sci Int. 2015 Mar;248:55-60. doi: 10.1016/j.forsciint.2014.12.022. Epub 2014 Dec 30.
The development of instruments and methods for explosive vapor detection is a continually evolving field of interest. A thorough understanding of the characteristic vapor signatures of explosive material is imperative for the development and testing of new and current detectors. In this research a headspace sampling chamber was designed to contain explosive materials for the controlled, reproducible sampling and characterization of vapors associated with these materials. In a detonation test, the chamber was shown to contain an explosion equivalent to three grams of trinitrotoluene (TNT) without damage to the chamber. The efficacy of the chamber in controlled headspace sampling was evaluated in laboratory tests with bulk explosive materials. Small quantities of TNT, triacetone triperoxide (TATP) and hexamethylene triperoxide diamine (HMTD) were separately placed in the sampling chamber, and the headspace of each material was analyzed by gas chromatography/mass spectrometry (GC/MS) with online cryogenic trapping to yield characteristic vapor signatures for each explosive compound. Chamber sampling conditions, temperature and sampling time, were varied to demonstrate suitability for precise headspace analysis.
用于爆炸物蒸汽检测的仪器和方法的开发是一个不断发展的研究领域。深入了解爆炸物材料的特征蒸汽信号对于新型和现有探测器的开发与测试至关重要。在本研究中，设计了一个顶空采样室，用于容纳爆炸物材料，以便对与这些材料相关的蒸汽进行可控、可重复的采样和表征。在一次爆炸试验中，该采样室被证明能够容纳相当于三克三硝基甲苯（TNT）的爆炸量，且采样室未受损。在使用散装爆炸物材料的实验室测试中，评估了该采样室在可控顶空采样方面的效能。将少量的TNT、三丙酮三过氧化合物（TATP）和六亚甲基三过氧化合物二胺（HMTD）分别置于采样室中，并采用在线低温捕集的气相色谱/质谱联用仪（GC/MS）对每种材料的顶空进行分析，以获取每种爆炸化合物的特征蒸汽信号。通过改变采样室的采样条件、温度和采样时间，证明其适用于精确的顶空分析。
