Fettig Ina, Krüger Simone, Deubel Jan H, Werrel Martin, Raspe Tina, Piechotta Christian
BAM Federal Institute for Materials Research and Testing, Analytical Chemistry, Reference Materials, Organic Environmental Analysis, Richard-Willstätter-Str. 11, 12489, Berlin, Germany.
J Forensic Sci. 2014 May;59(3):743-9. doi: 10.1111/1556-4029.12342. Epub 2013 Dec 13.
The chemical analysis of fire debris represents a crucial part in fire investigations to determine the cause of a fire. A headspace solid-phase microextraction (HS-SPME) procedure for the detection of ignitable liquids in fire debris using a fiber coated with a mixture of three different sorbent materials (Divinylbenzene/Carboxen/Polydimethylsiloxane, DVB/CAR/PDMS) is described. Gasoline and diesel fuel were spiked upon a preburnt matrix (wood charcoal), extracted and concentrated with HS-SPME and then analyzed with gas chromatography/mass spectrometry (GC/MS). The experimental conditions--extraction temperature, incubation and exposure time--were optimized. To assess the applicability of the method, fire debris samples were prepared in the smoke density chamber (SDC) and a controlled-atmosphere cone calorimeter. The developed methods were successfully applied to burnt particleboard and carpet samples. The results demonstrate that the procedure that has been developed here is suitable for detecting these ignitable liquids in highly burnt debris.
火灾残骸的化学分析是火灾调查中确定起火原因的关键环节。本文描述了一种顶空固相微萃取（HS-SPME）方法，用于检测火灾残骸中的可燃液体，该方法使用涂覆有三种不同吸附剂材料（二乙烯基苯/碳分子筛/聚二甲基硅氧烷，DVB/CAR/PDMS）混合物的纤维。将汽油和柴油添加到预燃烧的基质（木炭）上，用HS-SPME进行萃取和浓缩，然后用气相色谱/质谱联用仪（GC/MS）进行分析。对实验条件——萃取温度、孵育时间和暴露时间——进行了优化。为评估该方法的适用性，在烟雾密度室（SDC）和可控气氛锥形量热仪中制备了火灾残骸样本。所开发的方法成功应用于烧焦的刨花板和地毯样本。结果表明，本文所开发的方法适用于检测高度烧焦残骸中的这些可燃液体。
