Table 1.

GC×GC/ToF-MS optimized operation parameters for the analysis of PAHs with four different column combinations

	Combination "A1"	Combination "A2"	Combination "B"	Combination "C"
1D column	Rtx-5ms (35 m × 0.25 mm × 0.25 µm)	Rxi-5ms (10 m × 0.10 mm × 0.10 µm)	LC-50 (10 m × 0.15 mm × 0.10 µm)	LC-50 (10 m × 0.15 mm × 0.10 µm)
Max Temperature	320 °C	350 °C	270 °C	270 °C
2D column	Rxi-17 (1.2 m × 0.10 mm × 0.10 µm)	Rxi-17 (1.2 m × 0.10 mm × 0.10 µm)	Rxi-17 (1.2 m × 0.10 mm × 0.10 µm)	NSP-35 (1.2 m × 0.10 mm × 0.10 µm)
Max Temperature	360 °C	360 °C	360 °C	360 °C
Injection Volume	1 µL	1 µL	1 µL	1 µL
Inlet Temperature	300 °C	300 °C	250 °C	250 °C
Carrier Gas	He	He	He	He
Carrier Gas Flow	1.20 mL/min (constant)	0.80 mL/min (constant)	0.80 mL/min (constant)	0.80 mL/min (constant)
1D Oven Program	60 °C (1 min), 6 °C/min to 300 °C (3 min), 20 °C/min to 320 °C (19 min)	60 °C (3 min), 16 °C/min to 320 °C (6 min)	90 °C (2 min), 20 °C/min to 170 °C, 2 °C/min to 270 °C (120 min)	90 °C (2 min), 20 °C/min to 170 °C, 2 °C/min to 270 °C (120 min)
2D Oven Program	80 °C (1 min), 6 °C/min to 320 °C (3 min), 20 °C/min to 340 °C (19 min)	80 °C (3 min), 16 °C/min to 340 °C (6 min)	120 °C (2 min), 20 °C/min to 200 °C, 2.5 °C/min to 325 °C (120 min)	120 °C (2 min), 20 °C/min to 200 °C, 2.5 °C/min to 325 °C (120 min)
Modulator Temp. Offset	35 °C	35 °C	45 °C	45 °C
Modulation Time	5 s	7 s	5 s	5 s
Hot Pulse Time	1 s	1.5 s	1 s	1 s
Cold Time	1.5 s	2 s	1.5 s	1.5 s
Transfer Line Temp.	285 °C	285 °C	285 °C	285 °C
Ion Source Temperature	250 °C	250 °C	250 °C	250 °C
Scan Speed	151.5 spectra/second	151.5 spectra/second	151.5 spectra/second	151.5 spectra/second
Total run time	64 min	25.25 min	176 min	176 min