Volume 46, Issue 4 (July 2001)

    Evaluation of Principal Components Analysis with High-Performance Liquid Chromatography and Photodiode Array Detection for the Forensic Differentiation of Ballpoint Pen Inks

    (Received 20 March 2000; accepted 29 August 2000)

    CODEN: JFSOAD

      Format Pages Price  
    PDF 6 $25   ADD TO CART


    Abstract

    Inks from seven black and eight blue ballpoint pens were separated by a high-performance liquid chromatography (HPLC) method utilizing a photodiode array detection (PDA). A classifier flowchart was designed for the chromatographic data based on the presence or absence of certain peaks at different wavelengths to qualitatively discriminate between the inks. The same data were quantitatively classified by principal components analysis (PCA) to estimate the separation between a pair of classes of ink samples. It was found that the black ballpoint pen inks were discriminated satisfactorily utilizing two-dimensional data of the peak areas and retention times at the optimum wavelengths. The blue pens were discriminated by analyzing the chromatographic data at four different wavelengths simultaneously with a cross-validated PCA. The results of this study indicated that HPLC-PDA coupled with chemometrics could make a powerful discriminating tool for the forensic chemist, especially when analyzing extensive and/or complex data.


    Author Information:

    Kher, AA
    Materials and Forensic Science, University of Technology, Sydney, NSW

    Green, EV
    Materials and Forensic Science, University of Technology, Sydney, NSW

    Mulholland, MI
    Materials and Forensic Science, University of Technology, Sydney, NSW


    Stock #: JFS15061J

    ISSN: 0022-1198

    DOI: 10.1520/JFS15061J

    ASTM International
    is a member of CrossRef.

    Author
    Title Evaluation of Principal Components Analysis with High-Performance Liquid Chromatography and Photodiode Array Detection for the Forensic Differentiation of Ballpoint Pen Inks
    Symposium , 0000-00-00
    Committee E30