標題: Forensic applications of direct analysis in real time (DART) coupled to Q-orbitrap tandem mass spectrometry for the in situ analysis of pigments from paint evidence
作者: Chen, Tai-Hung
Wu, Shu-Pao
應用化學系
Department of Applied Chemistry
關鍵字: DART-MS;FTIR;Organic pigments
公開日期: 1-八月-2017
摘要: The accurate examination of paint fragments obtained from an accident, such as those obtained from vehicles involved in a hit-and-run case, is often critical in forensic investigations. However, organic pigments are typically minor components of automotive coatings, which makes discrimination difficult. In this study, direct analysis in real time coupled to Q-orbitrap tandem mass spectrometry (DART-MS) was employed to detect a wide range of common organic pigments in vehicle paints. Twelve common organic pigments used in vehicle paints, such as red, yellow, orange, and purple, were tested, and a database was constructed for future examinations of vehicle paint. Two hit-and-run vehicle accident cases, which occurred in New Taipei City, were investigated by Fourier transform infrared (FTIR) spectroscopy and DART-MS. First, FTIR spectroscopy was employed to study the paint samples as a preliminary screening step. Most of the observed IR peaks were attributed to binder and extenders present in paints. The IR peaks corresponding to the organic pigments were found to be weak and overlapped with those corresponding to resins. On the other hand, DART-MS successfully characterized the organic pigments. DART-MS was found to be excellent for rapidly determining the presence of organic pigments in paint samples without the need for a complicated pre-treatment process or lengthy analysis time. (C) 2017 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.forsciint.2017.06.001
http://hdl.handle.net/11536/145791
ISSN: 0379-0738
DOI: 10.1016/j.forsciint.2017.06.001
期刊: FORENSIC SCIENCE INTERNATIONAL
Volume: 277
起始頁: 179
結束頁: 187
顯示於類別:期刊論文