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

GC_EV1356
PeakstR 1 (sec)tR 2 (sec)
1.Benz[a]anthracene3,706.50.625
2.Cyclopenta[cd]pyrene3,726.00.620
3.Triphenylene3,735.00.620
4.Chrysene3,741.00.620
5.Benzo[b]fluoranthene4,213.50.625
6.Benzo[k]fluoranthene4,224.00.625
7.Benzo[j]fluoranthene4,231.50.620
8.Benzo[a]fluoranthene4,264.50.625
ColumnRxi-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)
Injection
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 GasHe, 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
DetectorTOFMS
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
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesThe 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.
AcknowledgementSample extract provided by Frank Dorman, Melinda Pham; The Pennsylvania State University