An Improvement on Pyrolysis Gas Chromatography for the Differentiation of Photocopy Toners

    Volume 38, Issue 4 (July 1993)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 21


    Huang, C-W
    Doctoral Student and Professor, Chung Yuan Christian University,

    Chang, W-T
    Doctoral Student and Professor, Chung Yuan Christian University,

    Giang, Y-S
    Professor, Central Police University, Taoyvan,

    (Received 29 October 1992; accepted 8 January 1993)

    Abstract

    During the past two decades, the great increase of the use of photocopying machines has given the forensic scientists many practical difficulties in identifying the origins of copied documents. Analysis of chemical properties of toners can be helpful for photocopier discrimination. Several techniques including infrared spectroscopy (IR) pyrolysis gas chromatography/mass spectrometry (Py-GC-MS) and scanning electron microscope-energy dispersive X-ray analysis (SEM-EDX) have been extensively used.

    In this study, a Curie-point pyrolyser, a dual wide-bore capillary column GC equipped with dual flame ionization detectors (FIDs) and a personal computer were connected online. The differentiation of photocopier toners, however, was based both on the comparison of retention indices and on conventional pattern recognition. The proposed method including the library search is quite simple, reliable and low-cost.


    Paper ID: JFS13482J

    DOI: 10.1520/JFS13482J

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    Title An Improvement on Pyrolysis Gas Chromatography for the Differentiation of Photocopy Toners
    Symposium , 0000-00-00
    Committee E30