Prenormative verification and validation of a protocol for measuring magnetite–maghemite ratios in magnetic nanoparticles
نویسندگان
چکیده
Abstract An important step in establishing any new metrological method is a prenormative interlaboratory study, designed to verify and validate the against its stated aims. Here, 57 Fe Mössbauer spectrometric ‘centre of gravity’ (COG) was tested as means quantifying magnetite/maghemite (Fe 3 O 4 /γ-Fe 2 ) composition ratio biphasic magnetic nanoparticles. The study involved seven laboratories across Europe North South America, six samples—a verification set three microcrystalline mixtures known composition, validation nanoparticle samples unknown composition. spectra were analysed by each participant using in-house fitting packages, ex post facto single operator an independent package. Repeatability analysis performed Mandel’s h statistic modified Youden plots. It shown that almost all (83/84) Mandel values fall within 0.5% significance level, with one exception being borderline. Youden-based pairwise indicates dominance random uncertainties; cases data phase only minor contributor overall measurement uncertainty. concluded COG robust promising candidate for intended purpose.
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ژورنال
عنوان ژورنال: Metrologia
سال: 2021
ISSN: ['0026-1394', '1681-7575']
DOI: https://doi.org/10.1088/1681-7575/ac36b6