G921-4 reference material
Certified values
Au, ppm0.44
ManufacturerGeostats
Packaging—
Values from the manufacturer's certificate. Exact tolerances (1SD, confidence intervals) are given in the certificate supplied with the pack.
What it is used for
Inserted into gold sample batches to check fire assay accuracy. A grade of 0.44 ppm suits QC of low-grade samples near cut-off.
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