Primary Reference Material. Whose value is accepted without requiring comparison to another chemical substance. Primary chemical reference substance.
A primary standard reference material is an ultra high purity grade compound used in analysis involving assay identification or purity tests. Secondary chemical reference substance. Primary chemical reference substance.
Secondary chemical reference substance.
So regardless of the amount of work done by the company the uncertainty of the secondary reference material will include a component due to the primary reference material. It can be a single compound or a mixture having the analyte of interest in a specified and certified amount. Substance whose characteristics are assigned and or calibrated by comparison with a primary chemical reference substance. The reference material hierarchy includes five major quality grades from national metrology and other primary standards to certified reference materials crms reference materials rms analytical standards and research grade or research chemicals.
