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Incurred Cypermethrins in a QuEChERS Extract of Marijuana by GCxGC on Rxi-5Sil MS and Rtx-200

PeakstR 1 (sec)tR 2 (sec)
1.Cypermethrin 12,2921.50
2.Cypermethrin 22,3041.54
3.Cypermethrin 32,3101.53
4.Cypermethrin 42,3131.58
ColumnRxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)
Rtx-200 1.3 m, 0.25 mm ID, 0.25 µm (cat.# 15020)
Inj. Vol.:1 µL splitless (hold 1 min)
Liner:Premium 4 mm single taper w/wool (cat.# 23303.1)
Inj. Temp.:250 °C
Purge Flow:40 mL/min
Oven Temp.:Rxi-5Sil MS: 80 °C (hold 1 min) to 310 °C at 5 °C/min
Rtx-200: 85 °C (hold 1 min) to 315 °C at 5 °C/min
Carrier GasHe, corrected constant flow (2 mL/min)
Modulator Temp. Offset:20 °C
Second Dimension Separation Time:3 sec
Hot Pulse Time:0.9 sec
Cool Time between Stages:0.6 sec
Transfer Line Temp.:290 °C
Analyzer Type:TOF
Source Temp.:225 °C
Electron Energy:70 eV
Mass Defect:-20 mu/100 u
Solvent Delay Time:5 min
Tune Type:PFTBA
Ionization Mode:EI
Acquisition Range:45-550 amu
Spectral Acquisition Rate:100 spectra/sec
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesRtx-200 (cat.# 15020) is a 15 m column. A 1.3 m section was used here as the second dimension column.