Evaluation of Desorption/Ionization Mass Spectrometric Methods in the Forensic Applications of the Analysis of Inks on Paper

    Volume 46, Issue 6 (November 2001)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 10


    Grim, DM
    Michigan State University, East Lansing, MI

    Allison, J
    Michigan State University, East Lansing, MI

    Siegel, J
    School of Criminal Justice, Michigan State University, East Lansing, MI

    (Received 5 September 2000; accepted 29 January 2001)

    Abstract

    Fast atom bombardment and laser desorption mass spectrometry (LDMS) provide molecular level information concerning an ink's composition. Two ink-jet printer inks, Ink A containing the cationic dye Methyl Violet 2B, and Ink B containing the anionic dye, Solvent Black, were studied. Both positive and negative ion detection modes of the mass spectrometer were used. LD may be used for the analysis of inks on paper. Once on paper, the ink's solvent system has evaporated, leaving mainly the dyes behind, which are detected using LDMS. An ink fades with time, indicating that the dyes are degrading. Preliminary results from an accelerated aging study of ballpoint pen ink using UV irradiation confirm that dye degradation products are formed. The degradation chemistry follows an oxidative demethylation process for which all products formed are detected using LDMS. Results suggest that LDMS may be developed to determine the relative age of inks.


    Paper ID: JFS15164J

    DOI: 10.1520/JFS15164J

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    Title Evaluation of Desorption/Ionization Mass Spectrometric Methods in the Forensic Applications of the Analysis of Inks on Paper
    Symposium , 0000-00-00
    Committee E30