Division of Identification and Forensic Science, Israel Police, National Headquarters, Jerusalem 91906, Israel.
Forensic Sci Int. 2011 Mar 20;206(1-3):150-4. doi: 10.1016/j.forsciint.2010.07.031. Epub 2010 Aug 21.
An arson suspect's contact with an ignitable liquid container can leave small traces of the substance on his hands, but detecting these traces is difficult. This research paper presents a method to obtain clear gasoline detection even 3h after hands have been moistened with 50 μL of gasoline using activated charcoal strips to adsorb the ignitable liquid traces directly from the suspect's hands. Light heating of the hands to 45 °C significantly increases the ability to detect gasoline traces. This methodology is part of a system to sample a suspect's hands at the scene of crime or in a police station. Samples are taken by investigators then analyzed in a laboratory. The suggested method provides an important improvement in detection sensitivity for ignitable liquids on suspect's hands.
纵火嫌疑犯接触可燃液体容器会在手上留下少量该物质的痕迹，但检测这些痕迹很困难。本研究论文提出了一种方法，使用活性炭条直接从嫌疑犯的手上吸附可燃液体痕迹，即使在手上被 50 μL 的汽油润湿 3 小时后，也能获得清晰的汽油检测结果。将手加热到 45°C 会显著提高检测汽油痕迹的能力。这种方法是在犯罪现场或警察局从嫌疑犯手上取样的系统的一部分。调查人员采集样本，然后在实验室进行分析。该方法为检测嫌疑犯手上的可燃液体的灵敏度提供了重要的改进。
