主管：中华人民共和国司法部
主办：司法鉴定科学研究院
ISSN 1671-2072  CN 31-1863/N
中国司法鉴定

中国司法鉴定 ›› 2012 ›› Issue (4): 13-21.

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  • 收稿日期:2012-06-20 出版日期:2012-07-15 发布日期:2022-07-18

Head space SPME sampling and vacuum outlet GC-MS for the non-invasive detection of organic explosives at the crime scene

Anthi Schoina1, Tim Pacqué1, Jan Dalmolen1, etc.   

  1. 1. Netherlands Forensic Institute, The Hague, The Netherlands; 2. Restek Corporation, Middelb urg, The Netherlands; 3. Restek Corporation, Bellefonte, PA , USA

  • Received:2012-06-20 Published:2012-07-15 Online:2022-07-18
  • About author:Arian van Asten, Prof dr, Male, Head of department at the Netherlands Forensic Institute, Professor in forensic analytical chemistry at the University of Amsterdam. Research Filed: Forensic analytical chemistry.

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Abstract:

The suitability of head space SPME (solid phase micro extraction) sampling for non-invasive detection of organic explosives at the crime scene is demonstrated. Vacuum outlet GC -MS is used for the analysis of the organic explosives materials absorbed on the SPME fiber. With this method low elution temperatures and short run times are achieved. Efficient SPME sampling is restricted to volatile and semi volatile organic explosives with vapor pressures equal to or higher than TNT (2,4,6 -trinitrotoluene ). The methodology is very suited for the non -invasive detection of the relatively volatile and instable compound TATP (triacetone-triperoxide ). This work shows that the realization of a static head space with a minimized volume provides optimal sensitivity. Sensitivity is also strongly affected by the ambient temperature at the crime scene. At given volume and sampling time the amount absorbed at the SPME fiber increases with temperature due to non -equilibrium effects. With appropriate containers and holders, SPME fibers can be effectively analyzed up to 3 days after sampling.

Key words: explosives, non-invasive detection, HS-SPME, vacuum outlet GC-MS

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