The Swedish Defence Research Agency (FOI), CBRN Defence and Security, SE-901 82 Umeå, Sweden.
Forensic Sci Int. 2012 Oct 10;222(1-3):e7-e12. doi: 10.1016/j.forsciint.2012.05.014. Epub 2012 Jun 15.
A 32-year-old man attempted to poison his ex-girlfriend with hydrogen cyanide by hiding the pesticide Uragan D2 in her car. During the police investigation, chemical analysis of the air inside the car was performed. Hydrogen cyanide was detected through on-site air analysis using a portable Fourier transform infrared (FTIR) spectroscopy gas analyzer and colorimetric gas detection tubes. Furthermore, impinger air-sampling was performed for off-site sample preparation and analysis by gas chromatography-mass spectrometry (GC-MS). All three independent techniques demonstrated the presence of hydrogen cyanide, at concentrations of 14-20 ppm. Owing to the high volatility of hydrogen cyanide, the temperature and the time since exposure have a substantial effect on the likelihood of detecting hydrogen cyanide at a crime scene. The prevailing conditions (closed space, low temperature) must have supported the preservation of HCN in the car thus enabling the identification even though the analysis was performed several days after the hydrogen cyanide source was removed. This paper demonstrates the applicability of combining on-site FTIR measurements and off-site GC-MS analysis of a crime scene in order to ensure fast detection as well as unambiguous identification for forensic purposes of hydrogen cyanide in air.
一名 32 岁男子试图将农药“Uragan D2”藏在其前女友的车内来毒害她。在警方调查过程中，对车内空气进行了化学分析。使用便携式傅里叶变换红外（FTIR）光谱气体分析仪和比色气体检测管进行现场空气分析，检测到了氰化氢。此外，还进行了冲击器空气采样，用于通过气相色谱-质谱法（GC-MS）进行场外样品制备和分析。所有三种独立技术均表明存在氰化氢，浓度为 14-20ppm。由于氰化氢的高挥发性，温度和暴露时间对在犯罪现场检测到氰化氢的可能性有很大影响。当时的环境条件（密闭空间、低温）必须有利于 HCN 在车内的保存，因此即使在氰化氢源被清除数天后进行分析，也能够识别出氰化氢。本文证明了结合现场 FTIR 测量和场外 GC-MS 分析在犯罪现场进行的应用，以便确保快速检测，并为法医目的明确鉴定空气中的氰化氢。
