Dipartimento SAIMLAL, SAPIENZA Universita di Roma, Viale Regina Elena 336, 00161 Rome, Italy.
Forensic Sci Int. 2013 Jan 10;224(1-3):96-100. doi: 10.1016/j.forsciint.2012.11.005. Epub 2012 Dec 6.
The method of sample recovery for trace detection and identification of explosives plays a critical role in several criminal investigations. After bombing, there can be difficulties in sending big objects to a laboratory for analysis. Traces can also be searched for on large surfaces, on hands of suspects or on surfaces where the explosive was placed during preparatory phases (e.g. places where an IED was assembled, vehicles used for transportation, etc.). In this work, triacetone triperoxide (TATP) was synthesized from commercial precursors following reported methods. Several portions of about 6mg of TATP were then spread on different surfaces (e.g. floors, tables, etc.) or used in handling tests. Three different swabbing systems were used: a commercial swab, pre-wetted with propan-2-ol (isopropanol) and water (7:3), dry paper swabs, and cotton swabs wetted with propan-2-ol. Paper and commercial swabs were also used to sample a metal plate, where a small charge of about 4g of TATP was detonated. Swabs were sealed in small glass jars with screw caps and Parafilm(®) M and sent to the laboratory for analysis. Swabs were extracted and analysed several weeks later by gas chromatography/mass spectrometry. All the three systems gave positive results, but wetted swabs collected higher amounts of TATP. The developed procedure showed its suitability for use in real cases, allowing TATP detection in several simulations, including a situation in which people wash their hands after handling the explosive.
用于痕量爆炸物检测和识别的样品回收方法在许多刑事调查中起着至关重要的作用。爆炸发生后，将大型物体送到实验室进行分析可能会有困难。也可以在大表面、嫌疑人的手上或在爆炸物准备阶段放置的表面上（例如，简易爆炸装置组装的地方、用于运输的车辆等）寻找痕迹。在这项工作中，根据报道的方法，从商业前体合成了三乙酰基过氧化物（TATP）。然后将大约 6mg 的 TATP 几部分散布在不同的表面上（例如地板、桌子等）或用于处理测试。使用了三种不同的擦拭系统：一种商用擦拭器，用丙-2-醇（异丙醇）和水（7:3）预润湿；干纸擦拭器，以及用丙-2-醇润湿的棉拭子。还使用纸和商用拭子对一块金属板进行了采样，在这块金属板上引爆了约 4g 的 TATP 小炸药。拭子密封在带有螺旋盖和 Parafilm(®) M 的小玻璃罐中，并送到实验室进行分析。几周后，通过气相色谱/质谱法对拭子进行了提取和分析。所有三种系统都得到了阳性结果，但润湿的拭子收集到的 TATP 量更高。所开发的程序表明它适用于实际情况，允许在几种模拟中检测 TATP，包括在人们处理完爆炸物后洗手的情况下。
