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The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
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Analysis of Explosives by GC-UV.

Jan Andrasko1, Ludmila Lagesson-Andrasko1, Johan Dahlén2

  • 1GC-UV Center, Kobergsgränd 2, Linköping, SE-587 31, Sweden.

Journal of Forensic Sciences
|January 11, 2017
PubMed
Summary

This study introduces a novel gas chromatography-UV spectrophotometry method for explosive analysis. It simultaneously detects explosives and their decomposition products, enhancing identification accuracy.

Keywords:
explosive analysisforensic sciencegas chromatography-ultraviolet spectrophotometrynitrate esterstriacetone triperoxideultraviolet detectionultraviolet spectra

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Area of Science:

  • Analytical Chemistry
  • Forensic Science

Background:

  • Traditional explosive analysis often relies solely on detecting the target analyte.
  • Enhanced identification methods are crucial for forensic applications.

Purpose of the Study:

  • To develop a gas chromatography-UV spectrophotometry method for simultaneous detection of explosives and their decomposition products.
  • To improve the qualitative identification of explosives.

Main Methods:

  • Gas chromatography (GC) coupled with ultraviolet (UV) spectrophotometry (178-330 nm).
  • Controlled partial decomposition of explosives in the GC transfer line at elevated temperatures.
  • Real-time spectral analysis of parent compounds and their decomposition products.

Main Results:

  • Successful recording of gas-phase UV spectra for 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (DNT), ethylene glycol dinitrate (EGDN), glycerine trinitrate (NG), triacetone triperoxide (TATP), and pentaerythritol tetranitrate (PETN).
  • Simultaneous detection of parent explosives and their decomposition products (e.g., NO from EGDN, NG, PETN; acetone from TATP).
  • TNT and DNT showed no decomposition under the tested conditions.

Conclusions:

  • The GC-UV spectrophotometry approach provides an advanced level of qualitative identification for explosives.
  • Simultaneous detection of analytes and decomposition products offers a more comprehensive analysis than traditional methods.
  • This method enhances the reliability of explosive identification in forensic investigations.