Table 1. Analysis conditions of gas chromatography-mass spectroscopy for the eight polycyclic aromatic hydrocarbons.

Instrument	Agilent Technologies 689ON/5975 MSD
Column	HP-5MS 30 m 0.25 mm ID 0.25 μm
Column oven temperature	80 (1 min) → 245 (6/min) → 270 (30/min, hold 10 min) → 310 (10 min, post run)
Carrier gas	Helium (1.0 mL/min)
Injection volume and temperature	1.0 μL (Splitless), 270
MS source temperature/MS quadrupole temperature	230/150
MS mode	SIM