Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples
The forensic identification of bulk explosives plays a significant role in bombing investigation. The type and composition of explosives can be used to link suspects to a bombing crime. In this study solid- phase microextraction (SPME) was employed for the recovery of seven selected nitro explosives...
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my.utm.139292020-06-15T03:46:22Z http://eprints.utm.my/id/eprint/13929/ Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples Ahmad, Umi Kalthom Kiu, Kee Heng Q Science (General) The forensic identification of bulk explosives plays a significant role in bombing investigation. The type and composition of explosives can be used to link suspects to a bombing crime. In this study solid- phase microextraction (SPME) was employed for the recovery of seven selected nitro explosives from the aqueous samples using gas chromatography-electron capture detector (GC-ECD). SPME parameters including extraction time, desorption time, desorption temperature, and the concentration of sodium chloride (NaCl) for salting-out effect were optimized using Carboxen/polydimethylsiloxane (CAR/PDMS)-coated fiber. Addition of 10% (w/v) of NaCl in the aqueous compounds under study for the optimized SPME method was found to be within 2 to 10 ppb except for PETN (1.4 ppm). Solid-phase extraction (SPE) utilizing LiChrolut® EN sorbent was employed for an analyte preconcentration technique prior to SPME in post-blast water samples collected from sampling trays. Three water samples collected at two sampling points nearest to the explosion point were found to contain traces of PETN (0.020 – 0.039 ppm). SPE-SPME with direct immersion mode followed by GC-ECD analysis was found to be a viable method for the qualitative and quantitative analysis of explosive residues in post-blast water samples. 2007 Conference or Workshop Item PeerReviewed Ahmad, Umi Kalthom and Kiu, Kee Heng (2007) Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples. In: International Conference and Workshop on Basic and Applied Science (ICOWOBAS2007), 2007, Surabaya, Indonesia. |
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Q Science (General) Ahmad, Umi Kalthom Kiu, Kee Heng Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
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The forensic identification of bulk explosives plays a significant role in bombing investigation. The type and composition of explosives can be used to link suspects to a bombing crime. In this study solid- phase microextraction (SPME) was employed for the recovery of seven selected nitro explosives from the aqueous samples using gas chromatography-electron capture detector (GC-ECD). SPME parameters including extraction time, desorption time, desorption temperature, and the concentration of sodium chloride (NaCl) for salting-out effect were optimized using Carboxen/polydimethylsiloxane (CAR/PDMS)-coated fiber. Addition of 10% (w/v) of NaCl in the aqueous compounds under study for the optimized SPME method was found to be within 2 to 10 ppb except for PETN (1.4 ppm). Solid-phase extraction (SPE) utilizing LiChrolut® EN sorbent was employed for an analyte preconcentration technique prior to SPME in post-blast water samples collected from sampling trays. Three water samples collected at two sampling points nearest to the explosion point were found to contain traces of PETN (0.020 – 0.039 ppm). SPE-SPME with direct immersion mode followed by GC-ECD analysis was found to be a viable method for the qualitative and quantitative analysis of explosive residues in post-blast water samples. |
format |
Conference or Workshop Item |
author |
Ahmad, Umi Kalthom Kiu, Kee Heng |
author_facet |
Ahmad, Umi Kalthom Kiu, Kee Heng |
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Ahmad, Umi Kalthom |
title |
Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
title_short |
Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
title_full |
Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
title_fullStr |
Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
title_full_unstemmed |
Direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
title_sort |
direct immersion solid phase microextraction for the forensic detection of explosives in post-blast water samples |
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2007 |
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http://eprints.utm.my/id/eprint/13929/ |
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1672610419833831424 |
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13.18916 |