Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure

Ink analysis is one of the most important area in forensic document examinations. It involves the analysis of ink of a writing instrument or printer machine. The main purpose of ink analysis is to identify the origin or source of the ink deposited on a substrate such as a paper. Regarding on the ink...

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Main Author:	Joseph, Leviana Ferah
Format:	Thesis
Language:	English
Published:	2020
Subjects:	R Medicine
Online Access:	http://eprints.usm.my/48931/1/TESIS-LEVIANA%20FERAH%20JOSEPH-24%20pages.pdf
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id	my-usm-ep.48931
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spelling	my-usm-ep.489312021-04-19T08:28:59Z Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure 2020-09 Joseph, Leviana Ferah R Medicine Ink analysis is one of the most important area in forensic document examinations. It involves the analysis of ink of a writing instrument or printer machine. The main purpose of ink analysis is to identify the origin or source of the ink deposited on a substrate such as a paper. Regarding on the ink analysis of pens, study onto marker pen have been received less attention by researchers compared to ink analysis of ballpoint pens and gel pens. Inks analysis involving two types of techniques namely destructive and non-destructive technique. The aim of the present work is to discriminate black permanent marker pen inks of different brands using non-destructive Attenuated total reflectance (ATR) – Fourier transform infrared (FTIR) spectroscopy coupled with Principal Component analysis (PCA) and Linear discriminant analysis (LDA). The discrimination power for visual examinations provides only 47.62% and 28.57%, for direct visual examination and visual examination of IR spectra, respectively. Whereas for PCA and LDA the discrimination power is much higher. PCA provides 81.14% for both raw and standardised dataset and 95.2% for derivatised dataset of discrimination power. LDA provides 95.2%, 76.4% and 100% of correct classification of black marker ink samples for raw, standardised and derivatised dataset, respectively. It can be concluded that the chemometrics procedures, which are, principal component analysis and linear discriminant analysis provide better discrimination of permanent black marker pen inks as compared to visual examinations. 2020-09 Thesis http://eprints.usm.my/48931/ http://eprints.usm.my/48931/1/TESIS-LEVIANA%20FERAH%20JOSEPH-24%20pages.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Kesihatan
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	R Medicine
spellingShingle	R Medicine Joseph, Leviana Ferah Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
description	Ink analysis is one of the most important area in forensic document examinations. It involves the analysis of ink of a writing instrument or printer machine. The main purpose of ink analysis is to identify the origin or source of the ink deposited on a substrate such as a paper. Regarding on the ink analysis of pens, study onto marker pen have been received less attention by researchers compared to ink analysis of ballpoint pens and gel pens. Inks analysis involving two types of techniques namely destructive and non-destructive technique. The aim of the present work is to discriminate black permanent marker pen inks of different brands using non-destructive Attenuated total reflectance (ATR) – Fourier transform infrared (FTIR) spectroscopy coupled with Principal Component analysis (PCA) and Linear discriminant analysis (LDA). The discrimination power for visual examinations provides only 47.62% and 28.57%, for direct visual examination and visual examination of IR spectra, respectively. Whereas for PCA and LDA the discrimination power is much higher. PCA provides 81.14% for both raw and standardised dataset and 95.2% for derivatised dataset of discrimination power. LDA provides 95.2%, 76.4% and 100% of correct classification of black marker ink samples for raw, standardised and derivatised dataset, respectively. It can be concluded that the chemometrics procedures, which are, principal component analysis and linear discriminant analysis provide better discrimination of permanent black marker pen inks as compared to visual examinations.
format	Thesis
qualification_level	Master's degree
author	Joseph, Leviana Ferah
author_facet	Joseph, Leviana Ferah
author_sort	Joseph, Leviana Ferah
title	Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
title_short	Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
title_full	Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
title_fullStr	Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
title_full_unstemmed	Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
title_sort	forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Kesihatan
publishDate	2020
url	http://eprints.usm.my/48931/1/TESIS-LEVIANA%20FERAH%20JOSEPH-24%20pages.pdf
_version_	1747821974637248512

Forensic discrimination of black permanent marker pen inks using attenuated total reflection – fourier transform infrared spectroscopy (atr-ftir) with chemometrics procedure

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