UiO-66 Selective Enrichment Integrated with Thermal Desorption GC-MS for Detection of Benzene Homologues in Ambient Air

Table 1

Operating conditions of TD-GC-MS for BTX analysis.

TD method	GC-MS method
Sampling tube: mixture of UiO-66 and white support	GC method column: HP-5 MS (30 m × 0.25 mm × 0.25 μm);Initial temp.: 50°C
Desorption temp.: 180°C	Initial hold time: 5 min
Desorption time: 30 min	Oven rate: 10°C min^−1
Desorption flow rate: 50 mL min^−1	Final temp.: 250 °C; Final hold time: 5 min
Cold trap: Tenax TA (100 mm × 3.2 mm)	MS method; Ionization mode: EI (70 eV)
Adsorption temp.: −10°C	Ion source temp.: 250°C
Desorption temp.: 300°C	Transfer line temp.: 250°C
Desorption time: 5 min	TIC scan range: 50–500 m/z
Column flow rate: 1 mL min^−1	Selected ions; Benzene: 78
Split ratio: 9	Toluene: 91, 92
Transfer line temp.: 250°C	o, p, m-Xylene: 91, 106
Valve temp.: 230°C