How to check the concentration of reference substances?

      

　　National reference materialIt is a reference material with the highest measurement quality and is determined by the benchmark method. From the above definition, it can be seen that the reference material has two significant characteristics: (1) for measurement purposes. This proves that some vague concepts about the reference material distinguish those "product series standard samples" (standard samples of grain, cotton, hemp, wool, etc.) that are not used to calibrate measurement instruments and measurement methods, and have no measurement accuracy requirements from the reference material; (2) with quantitative accuracy.

　　At present, national reference materials are mainly divided into primary reference materials and secondary reference materials. You can check the concentration of reference materials by searching on the national standard material network according to different reference material numbers. See the following for specific operation methods:

　　First, search for the number of the national reference material, such as:GBW (E)080299

　　Click on the product name to enter the product details page

　　Third, check the content of national standard substances

The standard value is the content of this reference material