Bulk oxide determinations from a pair of portland cements provides
the basis for calculation precision and accuracy values for X-ray
fluorescence (XRF) analysis for both the fused glass bead and the
pressed powder sample preparation. Approximately 45 laboratories
provided six replicates analyzed in duplicate for two separate
portland cements covering eleven analytes, CaO, SiO2, Al2O3, Fe2O3,
SO3, MgO, Na2O, K2O, TiO2, P2O5, and Cl, with the laboratories
roughly split between the two different sample preparations.
Chemical data using traditional chemical analyses (the Reference
Methods) from the Cement and Concrete Reference Laboratory (CCRL)
proficiency test program were included for comparison to the XRF
results.
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