Analysis of writing inks on paper using direct analysis in real time mass spectrometry

TitleAnalysis of writing inks on paper using direct analysis in real time mass spectrometry
Publication TypeJournal Article
Year of Publication2013
AuthorsJones RW, McClelland JF
Journal TitleForensic Science International
Volume231
Pages73-81
Date Published09
Type of ArticleArticle
ISBN Number0379-0738
Accession NumberWOS:000324043000020
Keywordsballpoint pen inks, Direct analysis in real time, discrimination, dyes, forensic analysis, forensic science, identification, Ink, mass spectrometry, PERFORMANCE LIQUID-CHROMATOGRAPHY, perspectives, QUANTIFICATION, Questioned documents, raman-spectroscopy, THIN-LAYER-CHROMATOGRAPHY
Abstract

Ink analysis is central to questioned document examination. We applied direct analysis in real time mass spectrometry (DART MS) to ballpoint, gel, and fluid writing ink analysis. DART MS acquires the mass spectrum of an ink while it is still on a document without altering the appearance of the document. Spectra were acquired from ink on a variety of papers, and the spectrum of the blank paper could be subtracted out to produce a cleanly isolated ink spectrum in most cases. Only certain heavy or heavily processed papers interfered. The time since an ink is written on paper has a large effect on its spectrum. DART spectra change radically during the first few months after an ink is written as the more volatile components evaporate, but the spectra stabilize after that. A library-search study involving 166 well-aged inks assessed the ability to identify inks from their DART spectra. The aggregate success rate was 92%. (c) 2013 Elsevier Ireland Ltd. All rights reserved.

URL<Go to ISI>://WOS:000324043000020
DOI10.1016/j.forsciint.2013.04.016