1. Preparation of lively standard gas

Some gases are particularly active in nature and easily react with oxygen and water packaging container materials to cause changes in concentration. In the 1980s, the United States NIST and some special gas companies such as SCOTT developed the inner coating technology for steel cylinders through experiments. This technology effectively prevents the reactive gas from reacting with the inner wall of the steel cylinder, which increases the stability of the gas.

2. Preparation of volatile organic compound standard gas

Volatile organic compounds are an important indicator for studying indoor air pollution. In the past, these standard gases were prepared by permeation or diffusion methods, and standard gases of different concentrations were obtained by changing the temperature and the geometry of the diffusion tube. At present, there are as many as 39 traceable NIST-valued VOCs standard gases.

In recent years, with the introduction and digestion of world advanced gas distribution technology, coupled with the efforts of several generations of scientific research workers, China has made rapid development in the preparation of standard gases.