Table 1.
Dimensions, gases, and operating parameters of the GC-IMS system
| Parameters | Value |
|---|---|
| Sample loop volume | 250 μL |
| Sample loop gas flow | 30 mLs/min |
| Sample gas | Air (purified) |
| GC carrier gas flow | 30 mLs/min |
| GC carrier gas | Air (purified) |
| IMS drift gas flow | 120 mLs /min |
| IMS drift gas | Air (purified) |
| Dew point of drift, sample and GC carrier gas | − 90 °C |
| IMS ionization source | Tritium |
| IMS ionization source activity | 130 MBq |
| IMS ionization source active diameter | 10 mm |
| Field switching injection field | 282.5 V/mm |
| Field switching blocking field | − 0.25 V/mm and 0.45 V/mm |
| Drift length L | 40.6 mm |
| Drift region diameter | 8 mm |
| Drift region field | 63.5 V/mm |
| Repetition rate | 80 Hz |
| GC column length | 1.07 m |
| Dew point of drift gas and sample gas | − 90 °C |
| GC and sample loop temperature | 40 °C |
| IMS temperature T | 38 °C |
| Inner IMS pressure p | 1001–1019.5 hPa |