GC-MS Determination of 36 Volatile Organic Compounds in Surface Coating Exhaust Gas with Sorbent Adsorption and Thermal Desorption

The sample of surface coating exhaust gas was concentrated with sorbent adsorption. After thermal desorption, GC-MS was applied to the determination of 36 volatile organic compounds in surface coating exhaust gas. The SH-Rtx-624 chromatographic column was used for GC separation and the full scanning mode was adopted in MS determination. Internal standard method was used for quantitative. Detection limits (3S/N) of the 36 volatile organic compounds were in the range of 0.018-2.96 ng. On the base of blank sample, test for recovery was made by standard addition method; values of recovery found were in the range of 84.5%-111%, with RSDs (n=6) of determined values in the range of 1.7%-14%.