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Is it really necessary to use matrix reference materials?

It is global best practice for there to be a specific reference material for every type of sample sent to the laboratory.

The use of control samples that closely match the material being sampled will make life easier for the analyst and will result in fewer failed batches.

You may need to use the closest match available if there isn’t an exact match.

Synthetic gold standards may be an acceptable substitute for some ore types but they are really easy to get a good analysis from and they don’t really test the assayer.

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