Table 1.
Operating conditions of TD and GC/MS system for the analysis of VOC.
| Parameter | Conditions |
|---|---|
| (A) Thermal desorber (TD) | |
| Desorption temperature | 325°C |
| Desorption flow rate and time | 30 mL/min, 15 min |
| Cold trap material | Liquid N2 or adsorber |
| Cold trap temperature | −50°C |
|
| |
| (B) GC/MS system | |
| Injector temperature | 300°C |
| Carrier gas | He |
| GC column | DB-1 capillary column |
| (0.32 mm, 60 m, 1 μm) | |
| Column flow rate | 1.2 mL/min |
| Temperature program | 40°C (5 min)—4°C/min (180°C)— |
| 20°C/min (250°C)—250°C (10 min) | |
| MS source temperature | 250°C |
| Detector type | Electron impact ionization |
| Mass range | 35~350 amu |
| Electron energy | 70 eV |