Polycyclic Aromatic Hydrocarbons (PAHs) in a Spring Creek Sediment Sample by GCxGC-TOFMS

Injection
Column	Rxi-PAH 60 m, 0.25 mm ID, 0.10 µm (cat.# 49317)
	Rxi-1HT 1 m, 0.25 mm ID, 0.10 µm (cat.# 13950)

Inj. Vol.:	1 µL splitless (hold 1.5 min)
Liner:	Premium 4 mm single taper w/wool (cat.# 23303.5)
Inj. Temp.:	275 °C
Purge Flow:	40 mL/min
Oven
Oven Temp.:	Rxi-PAH: 80 °C (hold 1.5 min) to 320 °C at 3 °C/min (hold 18.5 min) Rxi-1HT: 85 °C (hold 3.17 min) to 320 °C at 3 °C/min (hold 18.5 min)
Carrier Gas	He, corrected constant flow (1.4 mL/min)
Modulation
Modulator Temp. Offset:	20 °C
Second Dimension Separation Time:	1.5 sec
Hot Pulse Time:	0.45 sec
Cool Time between Stages:	0.35 sec

Detector	TOFMS
Transfer Line Temp.:	320 °C
Analyzer Type:	TOF
Source Temp.:	300 °C
Electron Energy:	70 eV
Mass Defect:	-20 mu/100 u
Solvent Delay Time:	7 min
Tune Type:	PFTBA
Ionization Mode:	EI
Acquisition Range:	45-550 amu
Spectral Acquisition Rate:	200 spectra/sec
Instrument	LECO Pegasus 4D GCxGC-TOFMS
Notes	The Rxi-1HT column (cat.# 13950) is a 15 m column. A 1 m segment was cut off and used here as the second dimension column.
Acknowledgement	Sample extract provided by Frank Dorman, Melinda Pham; The Pennsylvania State University

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