Determination of Volatile Organic Compounds in Indoor Air by Adsorption/One-step Thermal Desorption/Gas Chromatography

Volatile Organic Compounds(VOCs) in indoor air were dynamically adsorbed by high polymer Tenax-TA and detected by one-step thermal desorption/capillary column gas chromatography/flame ionization detector (GC/FID). The temperature and time of thermal desorption were discussed in this article. Eight typical toxic pollutants including benzene and toluene etc. in VOCs were quantitatively detected. External calibration curve of these compounds were established, of which the liner correlation coefficient ranged from 0.9983～0.9999. The minimum detectable concentration of benzene etc. was 2×10~(-4)mg/m~(3). The repetitiveness, desorption efficiency and remaining of benzene and toluene etc. were also studied. The indoor air samples in a laboratory were also obtained and analyzed.