Gas standard samples and gas standard materials (hereinafter referred to as standard gases) as a kind of physical standards and measurement standards are widely used in scientific research, environmental testing, medical and health, petrochemicals, fertilizers, electric power, coal, metallurgy, machinery and other national economic fields. Standard gases have played an extremely important role in calibrating instruments and meters, evaluating measurement methods, transmitting and arbitrating measurement standards, and effectively implementing gas standards.

The uncertainty of the standard gas volume value introduced in the preparation process is mainly composed of the system air tightness and weighing error of the gas cylinder processing and preparation process. The preparation uncertainty can be reduced by improving the precision of the gas distribution equipment and strict preparation procedures.

The uncertainty of the prepared standard gas value caused by the analysis process mainly comes from the following aspects: one is that the standard gas value used by the analyzer is not accurate; the second is that the carrier gas system of the analytical instrument cannot guarantee the reference zero point gas; the third is that the sensitivity of the analytical instrument cannot reach the detection accuracy it should; the fourth is that the reproducibility of the analytical instrument is not ideal.

Therefore, it is necessary to establish a mathematical method to reduce or even eliminate the uncertainty of the standard gas component value caused by the analysis process.