Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography

The forensic identification of bulk explosive and postexplosion residues is important in bombing investigation. The information can be used to determine the type of explosive, to link the suspect to the bombing case and ultimately to provide evidence in court. Many analytical techniques have been ap...

Full description

Saved in:

Bibliographic Details
Main Author:	Kiu, Kee Heng
Format:	Thesis
Language:	English
Published:	2006
Subjects:	QD Chemistry
Online Access:	http://eprints.utm.my/id/eprint/4792/1/KiuKeeHengMFS2006.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.4792
record_format	uketd_dc
spelling	my-utm-ep.47922018-10-14T07:19:37Z Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography 2006-10 Kiu, Kee Heng QD Chemistry The forensic identification of bulk explosive and postexplosion residues is important in bombing investigation. The information can be used to determine the type of explosive, to link the suspect to the bombing case and ultimately to provide evidence in court. Many analytical techniques have been applied to the identification of explosives and explosive residues. In this study, a solid-phase microextraction (SPME) technique followed by gas chromatography (GC) was used to determine the explosive residues. Gas chromatography with electron capture detection (GC-ECD) is very sensitive towards post-blast residues and therefore useful for the determination of explosive molecules. Several parameters including adsorption time, desorption time and temperature, SPME fiber types, stirring effect and salting out effect were optimized to obtain reproducible data with good accuracy. Addition of 10 % w/v of NaCl in the aqueous medium and use of a Carboxen/Polydimethylsiloxane (CAR/PDMS) coating fiber led to optimal extraction efficiencies. LOD of studied explosive compounds for the optimized SPME method was quite low (0.02-0.10 ppm) except for PETN (0.67 ppm). SPME/GC-ECD was optimized and applied to the trace analysis of explosive residues in real pond water and water sample from collection trays. 2,6-DNT, TNT and PETN were successfully detected from water samples. For some sampling points, TNT and PETN were not detected due to the amount of explosives used and low concentration of the explosives in water samples. Direct Immersion SPME/GC-ECD was found to be applicable for qualitative and quantitative analysis of explosives in post blast water samples. 2006-10 Thesis http://eprints.utm.my/id/eprint/4792/ http://eprints.utm.my/id/eprint/4792/1/KiuKeeHengMFS2006.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:61535 masters Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	QD Chemistry
spellingShingle	QD Chemistry Kiu, Kee Heng Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
description	The forensic identification of bulk explosive and postexplosion residues is important in bombing investigation. The information can be used to determine the type of explosive, to link the suspect to the bombing case and ultimately to provide evidence in court. Many analytical techniques have been applied to the identification of explosives and explosive residues. In this study, a solid-phase microextraction (SPME) technique followed by gas chromatography (GC) was used to determine the explosive residues. Gas chromatography with electron capture detection (GC-ECD) is very sensitive towards post-blast residues and therefore useful for the determination of explosive molecules. Several parameters including adsorption time, desorption time and temperature, SPME fiber types, stirring effect and salting out effect were optimized to obtain reproducible data with good accuracy. Addition of 10 % w/v of NaCl in the aqueous medium and use of a Carboxen/Polydimethylsiloxane (CAR/PDMS) coating fiber led to optimal extraction efficiencies. LOD of studied explosive compounds for the optimized SPME method was quite low (0.02-0.10 ppm) except for PETN (0.67 ppm). SPME/GC-ECD was optimized and applied to the trace analysis of explosive residues in real pond water and water sample from collection trays. 2,6-DNT, TNT and PETN were successfully detected from water samples. For some sampling points, TNT and PETN were not detected due to the amount of explosives used and low concentration of the explosives in water samples. Direct Immersion SPME/GC-ECD was found to be applicable for qualitative and quantitative analysis of explosives in post blast water samples.
format	Thesis
qualification_level	Master's degree
author	Kiu, Kee Heng
author_facet	Kiu, Kee Heng
author_sort	Kiu, Kee Heng
title	Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
title_short	Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
title_full	Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
title_fullStr	Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
title_full_unstemmed	Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
title_sort	forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography
granting_institution	Universiti Teknologi Malaysia, Faculty of Science
granting_department	Faculty of Science
publishDate	2006
url	http://eprints.utm.my/id/eprint/4792/1/KiuKeeHengMFS2006.pdf
_version_	1747814546836291584

Forensic analysis of explosives from water samples using solid phase microextraction-gas chromatography

Similar Items