A Study of the Critical Uncertainty Contributions in the Analysis of PCBs in Ambient Air

Table 1

GC-MS method and optimisation parameters.

Gas chromatograph parameters
Injection mode	Splitless
Injection port temperature	275^°C
Injection volume	2 L
GC to MS transfer line temperature	290^°C
Carrier gas and flow rate	Helium; 1.8 mL⋅min^−1
Column	HP-5MS [(5% phenyl-) methyl-polysiloxane],
	30 m × 0.25 mm × 0.25 m (film thickness)
Temperature program	(1) 70^°C-hold for 2 minutes
	(2) ramp to 150^°C at 15^°C⋅min^−1-no hold
	(3) ramp to 300^°C at 10^°C⋅min^−1-hold for 5 minutes
	[Total time of program = 27.3 minutes]
Mass spectrometer parameters
Ion source temperature	250^°C
Quadrupole temperature	150^°C
Electron multiplier voltage	2800 V
Other tuning parameters	Optimised automatically