OREAS 723b
SKU: 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.
Specifications
- State: primary
- Matrix: granodiorite
- Mineralisation: crystalline vein
- CRM Group: Graphite
Certified Values
| Analyte | Certified Value | 1SD | 95% CL Low | 95% CL High | Method |
|---|---|---|---|---|---|
| C-(Graphite), Carbon, graphitic (wt.%) | 6.10 | 0.311 | 5.89 | 6.32 | Infrared Combustion |
Product Specifications
Certified Reference Values
| Analyte | Certified Value | Uncertainty (1SD) | 95% Confidence Low | 95% Confidence High | Method |
|---|
SD = Standard Deviation | CL = 95% Confidence Limits
Methods: AR = Aqua Regia, 4-Acid = 4-Acid Digestion, LBF = Lithium Borate Fusion, FA/AAS = Fire Assay with Atomic Absorption, LECO = LECO Combustion Analysis
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