Statistical evaluation of the reproducibility and the influence of paper on the analysis of black gel pen ink using laser desorption ionisation mass spectrometry

Details

Ressource 1Download: BIB_335C43A41721.P001.pdf (801.13 [Ko])
State: Public
Version: author
Serval ID
serval:BIB_335C43A41721
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Statistical evaluation of the reproducibility and the influence of paper on the analysis of black gel pen ink using laser desorption ionisation mass spectrometry
Journal
Journal of the American Society of Questioned Document Examiners
Author(s)
Iqbal A., Majcherczyk P., Weyermann C.
ISSN
1524-7287
Publication state
Published
Issued date
06/2012
Peer-reviewed
Oui
Volume
15
Number
1
Pages
31-40
Language
english
Abstract
Laser desorption ionisation mass spectrometry (LDI-MS) has demonstrated to be an excellent analytical method for the forensic analysis of inks on a questioned document. The ink can be analysed directly on its substrate (paper) and hence offers a fast method of analysis as sample preparation is kept to a minimum and more importantly, damage to the document is minimised. LDI-MS has also previously been reported to provide a high power of discrimination in the statistical comparison of ink samples and has the potential to be introduced as part of routine ink analysis. This paper looks into the methodology further and evaluates statistically the reproducibility and the influence of paper on black gel pen ink LDI-MS spectra; by comparing spectra of three different black gel pen inks on three different paper substrates. Although generally minimal, the influences of sample homogeneity and paper type were found to be sample dependent. This should be taken into account to avoid the risk of false differentiation of black gel pen ink samples. Other statistical approaches such as principal component analysis (PCA) proved to be a good alternative to correlation coefficients for the comparison of whole mass spectra.
Create date
07/05/2012 10:57
Last modification date
20/08/2019 13:19
Usage data