Many techniques used in an analytical or quality control laboratory use gases. It is important to use the right quality that will prevent possible interferences with the analysis. It is equally important to use a gas distribution system that will match the purity of the gas. This will ensure the quality of the gas in the cylinder remains the same as it travels to its point of use.
For specific gas quality requirement, please refer to the user manual of your instrument or detector.
You may also refer to the information here under as general guidelines.