A stable, high-purity material used in titrations and other chemical analyses to prepare solutions of precisely known concentration, or to determine the concentrations of substances which react with the primary standard material. For example, NaCl is a primary standard that can be used to determine the concentration of AgNO
3 in a soluti...
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http://antoine.frostburg.edu/chem/senese/101/glossary/p.shtml
A primary standard in metrology is a standard that is sufficiently accurate such that it is not calibrated by or subordinate to other standards. Primary standards are defined via other quantities like length, mass and time. Primary standards are used to calibrate other standards referred to as working standards. ==In chemistry== Standards are used...
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http://en.wikipedia.org/wiki/Primary_standard
(from the article `environmental works`) Drinking-water regulations include two types of standards: primary and secondary. Primary standards are designed to protect public health, whereas ...
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http://www.britannica.com/eb/a-z/p/112
A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.
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http://www.chemistry-dictionary.com/definition/primary+standard.php
standard that is designated or widely acknowledged as having the highest metrological qualities and whose value is accepted without reference to other standards of the same quantity NOTE 1 - The concept of a primary standard is equally valid for base quantities and derived quantities. NOTE 2 - A primary standard is never used directly for measureme...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=311-04-02
A substance of a known high degree of purity that undergoes one invariable reaction with the other reactant of interest.
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http://www.encyclo.co.uk/local/20728
A pollution limit based on health effects. Primary standards are set for criteria air pollutants.
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http://www.encyclo.co.uk/local/21292
A standard whose calibration is determined by the measurement of parameters usually different from the parameter for which it will be used as a standard.
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https://www.hunterlab.com/en/color-measurement-learning/glossary/
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