The forensic analysis of office paper using oxygen isotope ratio mass spectrometry. Part 1: Understanding the background population and homogeneity of paper for the comparison and discrimination of samples

Jones, K; Benson, S; Roux, C

The forensic analysis of office paper using oxygen isotope ratio mass spectrometry. Part 1: Understanding the background population and homogeneity of paper for the comparison and discrimination of samples

Jones, K

Benson, S Roux, C

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Publication Type:: Journal Article
Citation:: Forensic Science International, 2016, 262 pp. 97 - 107
Issue Date:: 2016-05-01

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Field	Value	Language
dc.contributor.author	Jones, K https://orcid.org/0000-0001-8189-8534	en_US
dc.contributor.author	Benson, S	en_US
dc.contributor.author	Roux, C https://orcid.org/0000-0003-3610-420X	en_US
dc.date.available	2016-02-22	en_US
dc.date.issued	2016-05-01	en_US
dc.identifier.citation	Forensic Science International, 2016, 262 pp. 97 - 107	en_US
dc.identifier.issn	0379-0738	en_US
dc.identifier.uri	http://hdl.handle.net/10453/107121
dc.description.abstract	© 2016. Isotope ratio mass spectrometry (IRMS) using carbon isotopes has previously been shown to be a robust and discriminating technique for the comparison of document papers. This study aims to examine the inter and intra sample variability for oxygen isotopes measured in standard 80gsm white document papers, to inform the comparison of document papers in forensic casework.123 paper samples collected from Australia and New Zealand over a 24-month period were measured for their bulk oxygen isotopic abundance and were found to sit within a range of 15 ‰. A homogeneity study was undertaken which included examining the variability of samples at the sheet, ream and brand source levels. The results of this study were used to construct guidelines for sample comparison and as such, 95% confidence intervals were observed to be inappropriate for use given the high intra sample variability. Instead, a 1.4 ‰ discrimination range (0.7 ‰ either side of the measured value) was defined for use as a benchmark for discrimination when samples were measured in the same sequence. Utilising this value, 82% of the samples could be discriminated using a paired comparison, demonstrating a strong potential for use within forensic casework.	en_US
dc.relation.ispartof	Forensic Science International	en_US
dc.relation.isbasedon	10.1016/j.forsciint.2016.02.035	en_US
dc.subject.classification	Legal & Forensic Medicine	en_US
dc.title	The forensic analysis of office paper using oxygen isotope ratio mass spectrometry. Part 1: Understanding the background population and homogeneity of paper for the comparison and discrimination of samples	en_US
dc.type	Journal Article
utslib.citation.volume	262	en_US
utslib.for	039902 Forensic Chemistry	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CFS - Centre for Forensic Science
pubs.organisational-group	/University of Technology Sydney/Students
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	262	en_US

Abstract:

© 2016. Isotope ratio mass spectrometry (IRMS) using carbon isotopes has previously been shown to be a robust and discriminating technique for the comparison of document papers. This study aims to examine the inter and intra sample variability for oxygen isotopes measured in standard 80gsm white document papers, to inform the comparison of document papers in forensic casework.123 paper samples collected from Australia and New Zealand over a 24-month period were measured for their bulk oxygen isotopic abundance and were found to sit within a range of 15 ‰. A homogeneity study was undertaken which included examining the variability of samples at the sheet, ream and brand source levels. The results of this study were used to construct guidelines for sample comparison and as such, 95% confidence intervals were observed to be inappropriate for use given the high intra sample variability. Instead, a 1.4 ‰ discrimination range (0.7 ‰ either side of the measured value) was defined for use as a benchmark for discrimination when samples were measured in the same sequence. Utilising this value, 82% of the samples could be discriminated using a paired comparison, demonstrating a strong potential for use within forensic casework.

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http://hdl.handle.net/10453/107121