Evaluation of geochemical sedimentary reference materials of the Geological Survey of Japan (GSJ) by an objective outlier rejection statistical method

摘要: Nine geochemical sedimentary reference materials (RMs), JCh-1, JDo-1, JLs-1, JSl-1, JSl-2, JLk-1, JSd-1, JSd-2 and JSd-3, of the Geological Survey Japan (GSJ) were evaluated by an objective outlier rejection statistical method. An extensive chemical database for these materials, created from Internet website GSJ Geochemical Reference Samples Database (http://riodb02.ibase.aist. go.jp/geostand/) research articles published up to December 2008, is a scheme consisting of: (i) detection elimination discordant values with application 33 discordancy test variants (instead routinely used inaccurate “two-standard deviation” method); (ii) calculation new central tendency dispersion parameters; (iii) comparison confi dence limits (calculated incorporating recently available new, precise critical Student t-test) normalized mean difference percentages parameters obtained in present work those calculated data literature. Evaluation RMs more appropriate method resulted parameter values, also facilitated propose recommended fi rst time some parameters. The results this could be useful better calibrations models evaluation precision, accuracy, sensitivity limits.