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The Forensic Isotope Ratio Mass Spectrometry (FIRMS) network Good Practice Guide for Isotope Ratio Mass spectrometry
Philip J H Dunn1, Christopher Brodie2, Ethan Strak3
1National Measurement Laboratory, LGC, The Priestley Building, 10 Priestley Road, Guildford GU2 7XY, UK.
None:
The Forensic Isotope Ratio Mass Spectrometry (FIRMS) Network announce the publication of the Third Edition of the Good Practice Guide for Isotope Ratio Mass Spectrometry. In the third edition, changes include a new chapter on sampling covering method of sampling a population, sampling for homogeneity testing of a material as well as considerations for measurement uncertainty arising from sampling. The measurement uncertainty section has been revised and expanded to touch on alternative methods to combine uncertainty components together. Methods for measurement of water isotopic composition using equilibration have also been added. Additional detail has been included to expand on topics such as the difference between a reference gas and a working gas, additional tests that might be performed to check instrumental performance and initial data processing such as peak identification amongst others.
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