A primary standard material should be extremely pure which means that it should be a chemical of high grade of purity, preferably 99.98%. In a chemistry lab you will come across chemicals of different grade of purity. If you check the label you will notice a number with percentage termed as purity. So when a chemical has purity of 99.98% or more it is a suitable material to be considered for primary standard. From the name itself it is obvious that this is a standard which comes second. That’s why the name is secondary. A secondary standard is used by standard laboratories such as companies involved in preparation of reagents, kits or laboratories responsible for producing quality control material for other labs. They use primary standard as the primary calibrator or primary reference material. Secondary standard in turn is used for the purpose of calibration of control material in smaller lab for analysis of unknown concentration of a substance. So basically, secondary standard serves the purpose of external quality control for smaller labs. This makes it essential that the secondary standard must first be standardized against the primary standard.
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