UTILIZATION OF STANDARDS GENERATED IN THE PROCESS OF THERMAL-DECOMPOSITION CHEMICALLY-MODIFIED SILICA-GEL FOR A SINGLE-POINT CALIBRATION OFA GC FID SYSTEM/

The utilization of a multicomponent gaseous standard mixture, containi ng CO and CO2 and obtained by thermal decomposition of a so-called imm obilized compound, for a single point calibration of a GC/FID system a re described. The generation of such a mixture takes place as a result of thermal decomposition of a sample of chemically modified silica ge l placed in a heated chamber of thermal desorber coupled with the devi ce being calibrated via a catalytic methanizer. The mean amount of the analyte librated from unit mass of the gel was 0.71 mg g(-1) (RSD = 3 %) for carbon monoxide and 0.86 mg g(-1) (RSD = 3%) for carbon dioxide . (C) 1997 Elsevier Science B.V.