A reference standard is "the standard of measurement generally having the highest metrological characteristics in a given area or within a given organization, from which measurements made there are derived".

A Standard substance is a chemical used for comparison in chemical analysis, instrumental analysis, or to calibrate an instrument. Its chemical composition, content, physical and chemical properties and impurities contained must be known and conform to regulations or recognized.

The reference standard is the highest measurement standard of a laboratory with quantitative function, and is verified or calibrated by an institution that can provide traceability, that is, a legal metrological technical institution. In chemical analysis laboratories, standard substances are always used for quantification. The reference standard should only be used for calibration purposes and not for other purposes unless it can be demonstrated that the performance of the reference standard will not fail.

The standard material has the following characteristics:

(1) The quantity value of the standard substance is only related to the nature of the substance, and has nothing to do with the quantity and shape of the substance;

2, there are many types of standard substances, only the chemical component of the standard substance is thousands, and its limit range exceeds 12 orders of magnitude;

3, the standard material is practical, can be applied under actual working conditions, can be used to calibrate measuring instruments, evaluate the accuracy of measurement methods, can also be used for the quality evaluation of the measurement process and laboratory measurement certification and measurement arbitration;

4, the standard material has good reproducibility, can be prepared in batches and reproduced after use.

The above content is an introduction to what is a reference standard, what is a reference substance, a reference substance can also be used as a substance whose property value is known, and then used to study and evaluate the measurement of these components or properties. In this way, the accuracy and repeatability of the method can be judged, and the accuracy of the measurement method can be verified and improved to achieve a certain adaptability.