Title page for ETD etd-02082006-160506


Document Type Master's Dissertation
Author De Vos, Betty-Jane
URN etd-02082006-160506
Document Title Gas chromatography coupled with ion trap mass spectrometry (GC-MS and GC-MS-MS) - for arson debris analysis
Degree MSc (Applied Chemistry)
Department Chemistry
Supervisor
Advisor Name Title
Prof E R Rohwer
Keywords
  • no key words available
Date 2005-02-17
Availability unrestricted
Abstract
Gas chromatography - mass spectrometry (GC-MS) is an established instrumental technique used for the analysis of fire debris for accelerant detection. However, matrix problems, such as pyrolysis product interference, are still encountered. These interferences often lead to inconclusive interpretation of the chromatographic results.

This study describes methods for analysing arson accelerants using gas chromatography coupled with ion trap mass spectrometry. The latter technique lends itself to both conventional (GC-MS) as well as tandem mass spectrometry (GC-MS-MS). Since petrol (gasoline) is one of the more common distillate blends used by arsonists, especially in South Africa, the identification of petrol in fire debris samples was investigated. In order to overcome pyrolysis product interference and improve detection selectivity of the aromatic hydrocarbons in petrol residues, tandem mass spectrometry was used in combination with capillary gas chromatography. The added parameter of the third dimension of selectivity proved to be superior to conventional GC-MS in obtaining characteristic aromatic hydrocarbon profiles for petrol without interference from pyrolysis artefacts.

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  02annexures.pdf 560.40 Kb 00:02:35 00:01:20 00:01:10 00:00:35 00:00:02

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