OREAS 21h reference material
Certified values
Au, ppb<1
Material typeBlank: quartz sand with 0.5% added iron oxide
ManufacturerOREAS
Packaging—
Values from the manufacturer's certificate. Exact tolerances (1SD, confidence intervals) are given in the certificate supplied with the pack.
About the material
OREAS 21h is made from quartz sand with 0.5% added iron oxide. The pinkish-tan pulp looks like oxide material, so it cannot be told apart from routine samples.
What it is used for
Gold-free blank material is inserted after high-grade samples to check for contamination during sample preparation.
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