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NCJ Number: 229706 Find in a Library
Title: Forensic Analysis of Explosives Using Isotope Ratio Mass Spectrometry (IRMS)—Part 2: Forensic Inter-Laboratory Trial: Bulk Carbon and Nitrogen Stable Isotopes in a Range of Chemical Compounds (Australia and New Zealand)
Journal: Journal of Forensic Sciences  Volume:55  Issue:1  Dated:January 2010  Pages:205-212
Author(s): Sarah J. Benson, Ph.D.; Christopher J. Lennard, Ph.D.; Philip Maynard, Ph.D.; David M. Hill, B.Sc.; Anita S. Andrew, Ph.D.; Ken Neal, B.Sc.; Hilary Stuart-Williams Ph.D.; Janet Hope B.Sc.; G. Stewart Walker, Ph.D.; Claude Roux, Ph.D.
Date Published: January 2010
Page Count: 8
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: Comparability of data over time and between laboratories is a key issue for consideration in the development of global databases, and more broadly for quality assurance in general. One mechanism that can be utilized for evaluating traceability is an inter-laboratory trial.
Abstract: This paper addresses an inter-laboratory trial conducted across a number of Australian and New Zealand isotope ratio mass spectrometry (IRMS) laboratories. The main objective of this trial was to determine whether IRMS laboratories in these countries would record comparable values for the distributed samples. Four carbon-containing and four nitrogen-containing compounds were distributed to seven laboratories in Australia and one in New Zealand. The laboratories were requested to analyze the samples using their standard procedures. The data from each laboratory were evaluated collectively using International Standard ISO 13528 (Statistical methods for use in proficiency testing by inter-laboratory comparisons). "Warning signals" were raised against one participant in this trial. "Action signals" requiring corrective action were raised against four participants. These participants reviewed the data and possible sources for the discrepancies. This inter-laboratory trial was successful in providing an initial snapshot of the potential for traceability between the participating laboratories. The statistical methods described in this article could be used as a model for others needing to evaluate stable isotope results derived from multiple laboratories, e.g., inter-laboratory trials/proficiency testing. Ongoing trials will be conducted to improve traceability across the Australian and New Zealand IRMS community. 9 tables, 1 figures, 7 references, and appendix (Published abstract)
Main Term(s): Criminology
Index Term(s): Australia; Crime laboratories; Explosives; Explosives tracing; Foreign criminal justice research; Forensic sciences; Investigative techniques; Mass spectroscopy; New Zealand; Spectroscopy
Note: For Part 1 of this two-part article, see NCJ-229705.
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