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    Presumptive chemical tests

    Access Status
    Fulltext not available
    Authors
    Levine, B.
    Lewis, Simon
    Date
    2013
    Type
    Book Chapter
    
    Metadata
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    Citation
    Levine, B. and Lewis, S.W. 2013. Presumptive chemical tests, in Siegel, J.A. and Saukko, P.J. (ed), Encyclopedia of forensic sciences (2nd ed), pp. 616-620. Amsterdam: Elsevier.
    Source Title
    Encyclopedia of Forensic Sciences
    DOI
    10.1016/B978-0-12-382165-2.00253-1
    ISBN
    9780123821652
    URI
    http://hdl.handle.net/20.500.11937/5601
    Collection
    • Curtin Research Publications
    Abstract

    Microchemical tests are widely used by forensic scientists as screening tests to assist in the ultimate identification of substances in a wide range of evidence types including drugs, explosive residues, and biological material. Typically, microchemical tests are carried out by mixing a small amount of the test material with a reagent solution to produce a color change or the formation of characteristic microcrystals. These tests are performed either directly on, or after minimal clean-up of, the submitted material. No sophisticated equipment is required for the tests involving color changes as the endpoint of the color test is observed visually, whereas the results of microcrystalline tests will require observation with a microscope. These microchemical tests are only presumptive and any result must be confirmed by an alternative analytical technique, typically chromatography coupled with mass spectrometry. This article provides an overview of presumptive tests, with the exception of those used for serology, and their application to chemical forensic analysis.

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