Table 1. Analytical conditions of GC-MS/MS

Part	TRACE 1310 (GC)-TSQ 8000 Evo (MS/MS)
Column	Thermo Scientific TG-5MS (0.25 mm × 30 m, 0.25 μm)
Injection volume	1 μL
Carrier gas flow	He, 1.2 mL/min
Injection temp.	300°C
Split mode	Splitless
Oven temp.	Heating speed (°C/min)	Temp. (°C)	Hold time (min)
	-	90.0	1.50
	25.0	190.0	0.00
	4.0	260.0	0.00
	10.0	300.0	2.00
Ion source temp.	300°C