Aiming at the testing method of applying activated carbon to adsorb harmful substances,by the approval of experimental results in this paper,different testing results were obtained when selecting liquid standard substances and solid standard substances in different stat.

The preparation method of gas reference material for Kr and CF4 in He is discussed.

The preparation method of gas reference material for H2 and CF4 in Ar is discussed.

Taking the preparation of secondary gas reference material for CO_(2) in N_(2) as an example,approach preparation of secondary gas reference material is prepared by comparison method,and the analysis and calculation of uncertainty,in which reference material by weighing method.

In comparison with gravimetric method,dynamic volumetric method advantage,dynamic volumetric method preparing principle,preparing equipment,preparing process are introducedThe source of the certification uncertainty of dynamic volumetric method preparing calibration gas is analyzed,and the calculation of the related combined standard uncertainty.

The calibration gases of alcohol in nitrogen with about 10-6 were prepared in the form of diffusion tubes by dynamic volumetric method, the uncertainties of the calibration gases were in the range of 2%-3%.

In order to ensure the supply of standard material for chemistry production and apparatus,we did the research of high purity neon gas standard material.

Prepared the packaged gas standard material by using weighing method,fixed the value of the prepared gas standard material with the weighing result,and analyzed and calculated the indefinite degree of the fixed value.

This paper analyzes the status of development for marine reference materials at home and abroad, and discusses the importance for establishing the schematic system of marine reference materials.