ISO GUIDE 33
Uses of Certified Reference Materials
|Publication Date:||1 January 2000|
|ICS Code (Chemical reagents):||71.040.30|
This Guide discusses the uses of certified reference materials (CRMs) and their correct applications.
Clause 2 of this Guide presents definitions (with indication of their sources) of terms used, and clause 4 sets out the statistical considerations on which the Guide is based.
Clause 5 discusses the role of CRMs in measurement science and in realization of conventional measurement scales.
Clause 6 presents recommendations for developing criteria for the assessment of the precision and trueness of a measurement procedure by the use of CRMs. It pertains only to CRMs characterized to be homogeneous as described in ISO Guide 35 .
NOTE The use of CRMs is essential for assessment of trueness and optional for assessment of precision.
This Guide does not describe the use of certified reference materials as calibrants. This subject is treated in ISO Guide 32 .