"certified standards" is correct and usable in written English.
You can use it to refer to quality standards that have been approved by a recognized body or authority. For example, "The company adheres to certified standards to ensure the finest quality of products".
The samples were then analyzed for As, Cd, Fe, Mn, P, Pb, and Zn on a ICP-AES standardized using certified standards.
External standardization was via certified standards (Spex Industries, Inc., Edison, NJ).
All liver function tests, hematochemical and hormonal measurements, and virological analysis have been executed in the laboratory of our hospital with automated and standardized methods, in conformity to the quality certified standards EN ISO 9001 : 2000.
The field emission scanning electron microscope measurement scale bar was calibrated against certified standards.
Along the length of this luxury goods rialto were strollers, presumably Parisians, dressed according to the certified standards of taste that the French treat like trust fund principal, something one never invades.
All certified standards were > 98% purity grade.
Bovine liver certified standard (SRM no. 1577c certified; National Institute of Standard and Technology) and a pooled hair sample were similarly digested in perchloric acid and nitric acid, and were used as internal standards.
This design may be referred to as a certified standard design.
Certified standard solutions from FLUKA Analytical and Merck were used to quantify the analysed element.
The accuracy was tested by repeatedly measuring the certified standard CRMTMDW-A (High Purity Standards, USA).
Blanks and appropriate certified standard reference materials were analyzed as unknowns.
