Inter-laboratory analysis on precision and bias for XRF measurements on portland cements

What is it about?

Bulk oxide determinations from two pairs of portland cements provide the basis for calculating the precision and accuracy for X-ray fluorescence analyses for both the fused glass bead and the pressed powder sample preparation methods for eleven analytes: CaO, SiO2, Al2O3, Fe2O3, SO3, MgO, Na2O, K2O, TiO2, P2O5, and Cl. Precision measures for within- and between-laboratory performance are presented as 1-s and 95 % limits. Accuracy criteria are based upon a two-sided 95 % prediction interval for the mean of two test results, defining the range of values one might expect for each analyte relative to a certified value of a reference material.

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Why is it important?

The results of the study provide a picture of the within- and between-laboratory precision and bias for XRF analyses of cements, allowing any lab to test their protocol against the collective results of a large number of laboratories.