Andrasko Jan, Lagesson-Andrasko Ludmila, Dahlén Johan, Jonsson Bengt-Harald
GC-UV Center, Kobergsgränd 2, Linköping, SE-587 31, Sweden.
Department of Physics, Chemistry and Biology (IFM), University of Linköping, Linköping, SE-581 83, Sweden.
J Forensic Sci. 2017 Jul;62(4):1022-1027. doi: 10.1111/1556-4029.13364. Epub 2017 Jan 10.
A mixture of explosives was analyzed by gas chromatography (GC) linked to ultraviolet (UV) spectrophotometry that enabled detection in the range of 178-330 nm. The gas-phase UV spectra of 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), ethylene glycol dinitrate (EGDN), glycerine trinitrate (NG, nitroglycerine), triacetone triperoxide (TATP), and pentaerythritol tetranitrate (PETN) were successfully recorded. The most interesting aspect of the current application is that it enabled simultaneous detection of both the target analyte and its decomposition products. At suitable elevated temperatures of the transfer line between the GC instrument and the UV detector, a partial decomposition was accomplished. Detection was made in real time and resulted in overlaid spectra of the mother compound and its decomposition product. Hence, the presented approach added another level to the qualitative identification of the explosives in comparison with traditional methods that relies only on the detection of the target analyte. As expected, the decomposition product of EGDN, NG, and PETN was NO, while TATP degraded to acetone. DNT and TNT did not exhibit any decomposition at the temperatures used.
通过与紫外（UV）分光光度法联用的气相色谱（GC）对一种炸药混合物进行了分析，该方法能够在178 - 330纳米范围内进行检测。成功记录了2,4,6 - 三硝基甲苯（TNT）、2,4 - 二硝基甲苯（DNT）、乙二醇二硝酸酯（EGDN）、甘油三硝酸酯（NG，硝化甘油）、三丙酮三过氧化物（TATP）和季戊四醇四硝酸酯（PETN）的气相UV光谱。当前应用中最有趣的方面是它能够同时检测目标分析物及其分解产物。在气相色谱仪和紫外检测器之间的传输线处于合适的高温时，实现了部分分解。实时进行检测，得到母体化合物及其分解产物的叠加光谱。因此，与仅依赖目标分析物检测的传统方法相比，所提出的方法为炸药的定性鉴定增加了一个新层面。正如预期的那样，EGDN、NG和PETN的分解产物是NO，而TATP降解为丙酮。DNT和TNT在所用温度下未表现出任何分解。
