UTILIZATION OF THERMAL-DECOMPOSITION OF IMMOBILIZED COMPOUNDS FOR THEGENERATION OF GASEOUS STANDARD MIXTURES USED IN THE CALIBRATION OF GAS ANALYZERS

A new method of generation of gaseous standard mixtures has been devel oped in which the measured component is generated by the thermal decom position of a substance chemically bonded to the surface of silica gel (modified silica gel). The method enables preparation of a standard m ixture (generation of a measured component) immediately before the cal ibration step. Consequently, it can be applied primarily for the gener ation of standard mixtures containing volatile, malodorous, unstable a nd 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.