Forensic analysis of explosives using isotope ratio mass spectrometry (IRMS)-Part 1: instrument validation of the DELTAplusXP IRMS for bulk nitrogen isotope ratio measurements

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dc.contributor.authorBenson, SJen_AU
dc.contributor.authorLennard, CJen_AU
dc.contributor.authorHill, DMen_AU
dc.contributor.authorMaynard, Pen_AU
dc.contributor.authorRoux, Cen_AU
dc.date.accessioned2010-04-19T23:21:24Zen_AU
dc.date.accessioned2010-04-30T05:08:46Zen_AU
dc.date.available2010-04-19T23:21:24Zen_AU
dc.date.available2010-04-30T05:08:46Zen_AU
dc.date.issued2010-01en_AU
dc.date.statistics2010-01en_AU
dc.description.abstractA significant amount of research has been conducted into the use of stable isotopes to assist in determining the origin of various materials. The research conducted in the forensic field shows the potential of isotope ratio mass spectrometry (IRMS) to provide a level of discrimination not achievable utilizing traditional forensic techniques. Despite the research there have been few, if any, publications addressing the validation and measurement uncertainty of the technique for forensic applications. This study, the first in a planned series, presents validation data for the measurement of bulk nitrogen isotope ratios in ammonium nitrate (AN) using the DELTAplusXP (Thermo Finnigan) IRMS instrument equipped with a ConFlo III interface and FlashEA™ 1112 elemental analyzer (EA). Appropriate laboratory standards, analytical methods and correction calculations were developed and evaluated. A validation protocol was developed in line with the guidelines provided by the National Association of Testing Authorities, Australia (NATA). Performance characteristics including: accuracy, precision/repeatability, reproducibility/ruggedness, robustness, linear range, and measurement uncertainty were evaluated for the measurement of nitrogen isotope ratios in AN. AN (99.5%) and ammonium thiocyanate (99.99+%) were determined to be the most suitable laboratory standards and were calibrated against international standards (certified reference materials). All performance characteristics were within an acceptable range when potential uncertainties, including the manufacturer's uncertainty of the technique and standards, were taken into account. The experiments described in this article could be used as a model for validation of other instruments for similar purposes. Later studies in this series will address the more general issue of demonstrating that the IRMS technique is scientifically sound and fit-for-purpose in the forensic explosives analysis field. © 2010, Wiley-Blackwell.en_AU
dc.identifier.citationBenson, S. J., Lennard, C. J., Hill, D. M., Maynard, P., & Roux, C. (2010). Forensic analysis of explosives using isotope ratio mass spectrometry (IRMS)-Part 1: instrument validation of the DELTAplusXP IRMS for bulk nitrogen isotope ratio measurements. Journal of Forensic Sciences, 55(1), 193-204. doi:10.1111/j.1556-4029.2009.01241.xen_AU
dc.identifier.govdoc1564en_AU
dc.identifier.issn0022-1198en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Forensic Sciencesen_AU
dc.identifier.pagination193-204en_AU
dc.identifier.urihttp://dx.doi.org/10.1111/j.1556-4029.2009.01241.xen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3229en_AU
dc.identifier.volume55en_AU
dc.language.isoenen_AU
dc.publisherWiley-Blackwellen_AU
dc.subjectCrime detectionen_AU
dc.subjectIsotope ratioen_AU
dc.subjectMass spectroscopyen_AU
dc.subjectAmmonium nitratesen_AU
dc.subjectNitrogen isotopesen_AU
dc.subjectValidationen_AU
dc.titleForensic analysis of explosives using isotope ratio mass spectrometry (IRMS)-Part 1: instrument validation of the DELTAplusXP IRMS for bulk nitrogen isotope ratio measurementsen_AU
dc.typeJournal Articleen_AU
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