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GCxGC Contour Plot of Riser Pipe Oil in 2010 Gulf Oil Spill (Rxi-17Sil MS and Rxi-1ms)

ColumnRxi-17Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 14123)
Rxi-1ms 1.2 m, 0.15 mm ID, 0.15 µm (cat.# 43800)
Diluent:Methylene chloride
Inj. Vol.:1 µL splitless (hold 1 min)
Liner:Premium 4mm Single Taper w/Wool (cat.# 23303.1)
Inj. Temp.:250 °C
Purge Flow:40 mL/min
Oven Temp.:Rxi-17Sil MS: 40 °C (hold 1 min) to 320 °C at 3.5 °C/min (hold 4 min)
Rxi-1ms: 45 °C (hold 1 min) to 325 °C at 3.5 °C/min (hold 4 min)
Carrier GasHe, corrected constant flow (2.2 mL/min)
Modulator Temp. Offset:20 °C
Second Dimension Separation Time:4 sec
Hot Pulse Time:1.4 sec
Cool Time between Stages:0.6 sec
Transfer Line Temp.:300 °C
Analyzer Type:TOF
Source Temp.:250 °C
Electron Energy:70 eV
Mass Defect:50 mu/100 u
Solvent Delay Time:5 min
Tune Type:PFTBA
Ionization Mode:EI
Acquisition Range:45-550 amu
Spectral Acquisition Rate:200 spectra/sec
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesRxi-1ms (cat.# 43800) is a 10 m column. A 1.2 m section was used as the second dimension column.
AcknowledgementDr. Ed Overton, Professor Emeritus at Louisiana State University, for providing the riser pipe oil sample.