Fourier Transform Infrared (FTIR) Spectroscopy with Chemometric Techniques for the Classification of Ballpoint Pen Inks

Arab Journal of Forensic Sciences & Forensic Medicine

Dzulkiflee Ismail¹  Muhammad Naeim Mohamad Asri¹  Wan Nur Syuhaila Mat Desa¹ 

[1] Forensic Science Program, School of Health Sciences, Universiti Sains Malaysia;

关键词: Forensic Science, Principal Component Analysis (PCA), FTIR spectroscopy, Ballpoint pen inks, Direct Visual Comparison;   

DOI  :  10.12816/0017699

来源: DOAJ

【 摘 要 】

FTIR spectroscopic techniques have been shown to possess good abilities to analyse ballpoint pen inks. These in-situ techniques involve directing light onto ballpoint ink samples to generate an FTIR spectrum, providing “molecular fingerprints” of the ink samples thus allowing comparison by direct visual comparison. In this study, ink from blue (n=15) and red (n=15) ballpoint pens of five different brands: Kilometrico®, G-Soft®, Stabilo®, Pilot® and Faber Castell® was analysed using the FTIR technique with the objective of establishing a distinctive differentiation according to the brand. The resulting spectra were first compared and grouped manually. Due to the similarities in terms of colour and shade of the inks, distinctive differentiation could not be achieved by means of direct visual comparison. However, when the same spectral data was analysed by Principal Component Analysis (PCA) software, distinctive grouping of the ballpoint pen inks was achieved. Our results demonstrate that PCA can be used objectively to investigate ballpoint pen inks of similar colour and more importantly of different brands.

【 授权许可】

Unknown