Table 2.

Operating conditions of the GC-MS system.

Condition	Runoff water, rain water
Compounds	PAH, PCB
Injector	Split/splitless
Injector volume	2 μL
Carrier gas	Helium—70 kPa
Detector	Agilent 5975C inert MSD with electron ionization operating in SIM (selected ion monitoring) mode
Integration system	MSD ChemStation
Column	Zebron capillary GC column (30 m × 0.25 μm × 0.25 μm; max. temp. 320/340 °C)
Temperature programme	40 °C do 120 °C (at 40 °C/min) 120 °C do 280 °C (at 5 °C /min) 280 °C for 17 min and 5 min (PCBs)