The phrase "a primary standard of" is correct and usable in written English.
It can be used in contexts where you are discussing a fundamental benchmark or criterion for measurement or evaluation in a specific field.
Example: "The laboratory adopted a primary standard of purity to ensure the accuracy of its chemical analyses."
Alternatives: "a fundamental benchmark of" or "a key criterion of".
In 2011 a decision was made by Czech Metrology Institute to build a free-air ionization chamber (FAC) intended to be used as a primary standard of air kerma rate for low-energy X-rays (photon energy below 50 keV, including mammography X-ray qualities) in order to replace the currently used secondary ionization chamber and to decrease the uncertainty of air kerma reference value.
A primary standard of celecoxib (2,000 ppm) was prepared in acetonitrile.
A primary standard of 60 ppb, compared with 75 ppb, would prevent about 5 times as many premature deaths, about 4 times as many nonfatal heart attacks, about 8 times as many hospital and emergency room visits, and 9 times as many missed work and school days.
According to EPA calculations published as a supplement to the March 2008 regulatory impact analysis, a primary standard of 70 ppb would, by the year 2020, prevent about twice as many premature deaths and nearly that many nonfatal heart attacks as a standard of 75 ppb, and would prevent more than 2.5 times as many hospital and emergency room visits and missed work and school days.
Measurement of hepatic venous pressure gradient (HVPG) is established as a primary standard for evaluation of portal vein pressure, particularly in patients with hepatic (sinusoidal) portal hypertension.
Often a gas chromatographic mass spectrometric (GC MS) quantitative assay is developed and used as a primary standard for evaluation of less expensive assay methods.
The Obama administration's proposal sets a primary standard for ground-level ozone of no more than 0.060 to 0.070 parts per million, to be phased in over two decades.
A primary standard mixture of stearic and palmitic acids (65 35) was used for the calibration curve in the range of 0 15 g% using single linear regression analysis (Beer's Law).
Its performance was tested using a calibrated secondary chamber and then by an informal comparison with a national primary standard of BEV (Austria).
This, in effect, was the fixing of a primary standard, and devolved upon the Secretary of the Treasury the mere executive duty to effectuate the legislative policy declared in the statute.
[For more information, see "Ozone Nation: EPA Standard Panned by the People," EHP 116 A302 A305 (2008).] On 7 January 2010 the EPA announced it was proposing a primary standard within the range of 60 70 ppb along with a CASAC-sanctioned secondary standard within the range of 7 15 ppm-hours (a unit that accounts for both concentration and length of exposure to that concentration).
