Gas mixtures of the known composition by dynamic methods
DOI:
https://doi.org/10.17308/sorpchrom.2017.17/391Keywords:
calibration gas mixtures, gas chromatography, static methods, dynamic methods, polybubbler method, chromato-desorbtion method.Abstract
In the paper modern methods of obtaining gas mixtures of known composition are considered. This
gas mixtures characterized by stable for a time sufficient for the calibration carrying out. The features of dynamic
methods that have received the greatest practical application over a period of 15-20 years in Russian
and foreign source are discussed. The results of comparative analysis of the accuracy of preparation of gas
mixtures of volatile organic compounds by diffusion, polybubbler and chromato-desorption methods are presented.
The results of a comparison of the accuracy of preparation of gas mixtures of volatile organic compounds
by diffusion, polybubbler and chromato-desorption methods are presented. It is shown that the application
of chromato-desorption devices allows to obtain gas mixtures that stable for 10-60 hours in a dynamic
condition. This gas mixtures contain volatile aliphatic and aromatic hydrocarbons with an error no more than
7%. The chromato-desorption method is equal to the polybubbler and diffusion methods of obtaining gas
mixtures, but there is decreasing of the consumption of reagents by a decade.
