评估手持式拉曼光谱对深色散装爆炸物燃料-氧化剂混合物的法证分析。

Lúcio Paulo Lima Logrado, Bruna Miguel Ferreira da Silva, Breno Amaro da Silveira Neto
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引用次数: 0

摘要

爆炸物的现场识别对于应对犯罪至关重要,需要专门的规程,通常还需要爆炸物处理小组的支持,以确保安全。手持式拉曼光谱仪由于其便携性,无损分析和检测有机和无机化合物的能力而被广泛用于此目的。然而,他们的效力是有限的深色爆炸物-如黑火药,闪光粉,硫氯酸盐爆炸物-通常在犯罪活动中遇到。这些混合物带来了独特的挑战,包括由光吸收引起的光谱质量差以及在直接分析时着火的风险。本研究通过引入一种简单有效的方法,使用手持式拉曼光谱仪安全识别深色燃料-氧化剂混合物中的氧化盐,解决了这些挑战。该方法包括水萃取,然后对提取物进行拉曼分析,通过规避直接固体分析的局限性,提高安全性并产生可靠的结果。结果证实,直接分析这些混合物是不安全且无效的,有三种混合物在测试期间点燃,其他混合物提供的光谱数据不足。相比之下,水萃取法使用犯罪现场工具包中常见的基本材料,成功地鉴定了所有测试样品中的氧化盐。这项技术支持现场调查,例如查封可疑的爆炸性材料,有助于在现场调查期间作出决策。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of handheld Raman spectroscopy for forensic analysis of dark-colored bulk explosive fuel-oxidizer mixtures.

The field identification of explosives is critical for crime response, requiring specialized protocols and often the support of Explosive Ordnance Disposal (EOD) teams to ensure safety. Handheld Raman spectrometers are widely used for this purpose due to their portability, nondestructive analysis, and ability to detect both organic and inorganic compounds with minimal sample preparation. However, their effectiveness is limited for dark-colored explosives-such as black powder, flash powder, and sulfur-chlorate explosives-commonly encountered in criminal activities. These mixtures pose unique challenges, including poor spectral quality caused by light absorption and the risk of ignition during direct analysis. This study addresses these challenges by introducing a simple and effective methodology for the safe identification of oxidizing salts in dark-colored fuel-oxidizer mixtures using handheld Raman spectrometers. The approach involves aqueous extraction followed by Raman analysis of the extract, improving safety and yielding reliable results by circumventing the limitations of direct solid analysis. Results confirmed that direct analysis of these mixtures is unsafe and ineffective, with three mixtures igniting during testing and others providing insufficient spectral data. In contrast, the aqueous extraction method enabled the successful identification of oxidizing salts in all tested samples using basic materials commonly found in crime scene kits. This technique supports field investigations, such as the seizure of suspected explosive materials, helping in decision-making during on-site investigations.

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