Utilization of thermal decomposition of immobilized compounds for the generation of gaseous standard mixtures used in the calibration of gas analysers

Abstract

A new method of generation of gaseous standard mixtures has been developed in which the measured component is generated by the thermal decomposition of a substance chemically bonded to the surface of silica gel (modified silica gel). The method enables preparation of a standard mixture (generation of a measured component) immediately before the calibration step. Consequently, it can be applied primarily for the generation of standard mixtures containing volatile, malodorous, unstable and toxic compounds. The results of studies on the application of this method to the generation of multicomponent standard mixtures (mixtures of CO and CO₂ in nitrogen) are presented.