期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1515, 期 -, 页码 187-195出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2017.07.093
关键词
Chromatography; Ink; Dating; Solvent; Dyes; Multiple regression model
资金
- Canary Institute of Criminological Analysis (Instituto Canario de Ancilisis Criminologico)
- Atlantic Society of Criminalistics and Forensic Sciences (Sociedad Atlantica de Criminalistica y Ciencias Forenses)
An extraction and determination method is shown for the analysis of dyes and solvents present in two types of ballpoint pen inks that are deposited onto paper. Ink extracts are analysed using a combination of gas chromatography with mass spectrometry (GC MS), and high-pressure liquid chromatography with photodiode array detection (HPLC-DAD), within a single sample extraction procedure. Seventeen solvents and thirteen dyes contained in two Montblanc inks (black and blue) were monitored for 45 months at monthly intervals, in order to determine variations in the concentrations of the compounds over time. We also studied the relative variations between different compounds and the generation of degradation products such as phenol. The concentration data obtained from these compounds during their exposure have been analysed and a multiple regression model is developed for each ink type that allows an estimate of the exposure time of the ink on paper with a maximum error of between 4 and 7 months. (C) 2017 Elsevier B.V. All rights reserved.
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