OREAS 723b

OREAS 723b is a certified reference material (CRM) prepared from a high-grade graphite concentrate and a blend of granodiorite sourced from Oaklands Quarry, Tullamarine, located in northern Melbourne, Victoria.

The granodiorite is a coarse-grained intrusive igneous rock composed predominantly of quartz, plagioclase feldspar, and biotite, characteristic of Silurian-aged granitoid formations within the Melbourne Zone of Victoria.

OREAS 723b has been characterised for Total Graphite Carbon (TGC) by dilute acid (HCl) digestion followed by roasting at approx. 425 °C, then analysis by infrared combustion furnace. Nineteen commercial analytical laboratories participated in the certification program of this CRM.

Homogeneity was evaluated using 12 subsamples analysed in a single laboratory. ANOVA was applied to duplicates from six test units to compare within- and between-unit variances, providing a statistical measure of batch homogeneity.

Analyte Certified Value 1SD Expanded Uncertainty Low Expanded Uncertainty High Method
C-(Graphite), Carbon, graphitic (wt.%) 6.10 0.311 5.89 6.32 Infrared Combustion
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