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    Assessing a novel contact heater as a new method of recovering explosives traces from porous surfaces

    231203_231203.pdf (1.446Mb)
    Access Status
    Open access
    Authors
    Yu, H.
    Lewis, Simon
    Beardah, M.
    NicDaeid, N.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Yu, H. and Lewis, S. and Beardah, M. and NicDaeid, N. 2015. Assessing a novel contact heater as a new method of recovering explosives traces from porous surfaces. Talanta. 148: pp. 721-728.
    Source Title
    Talanta
    DOI
    10.1016/j.talanta.2015.07.082
    ISSN
    0039-9140
    School
    Department of Chemistry
    URI
    http://hdl.handle.net/20.500.11937/4970
    Collection
    • Curtin Research Publications
    Abstract

    It can be very challenging to recover explosives traces from porous surfaces, such as clothing and car seats, compared to non-porous surfaces. The contact heater has been developed as a novel instrument designed to recover explosives traces from porous surfaces. Samples are taken by heating and drawing air across a surface, with the air flowing through a sampling cartridge containing adsorbent polymer beads, which act to trap any recovered explosive material. Any collected explosive can then be eluted from this cartridge using a solvent, prior to analysis. This paper outlines work performed to evaluate the usefulness of the contact heater with regards to the recovery of explosives traces from porous materials. Ethylene glycol dinitrate (EGDN) and triacetone triperoxide (TATP) were chosen as two representative explosives for this study. Quantification was performed using GC–MS for EGDN and LC–MS/MS for TATP. Different sampling temperatures, sampling times and elution solvents were investigated. Recovery was trialled from leather, carpet and denim. Recoveries of up to 71% were obtained following optimisation. It was also possible to recover TATP from fabrics exposed to TATP vapour in a vapour-laden jar up to two hours after exposure. The contact heater therefore appears to be a very useful tool for the recovery of explosives traces from porous materials.

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