4. Reference materials
4.1 Mutual recognition agreement
Once confidential, reference materials (RMs), especially when certified, are playing an increasingly significant role in modern analytical sciences. In fact, ISO has set up a special Reference Material Committee (REMCO). It has defined two types of RM:
simple reference materials, the homogeneity and stability of one or more properties of which have been sufficiently established to make them suitable for the validation of a defined measurement procedure; this definition is fully applicable to the surplus of samples which may be available from a proficiency testing scheme realization (§
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Reference materials
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