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Pesticides in Dietary Supplements (Zoom of GCxGC-TOFMS Contour Plot)

ColumnRxi-5Sil MS 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)
Rtx-200 1.5 m, 0.18 mm ID, 0.20 µm (cat.# 45001)
SampleMixed pesticide standard
Conc.:2 ng/µL
Inj. Vol.:1 µL splitless (hold 1 min)
Liner:Gooseneck Splitless (4mm) w/Wool (cat.# 22405)
Inj. Temp.:250 °C
Purge Flow:40 mL/min
Oven Temp.:Rxi-5Sil MS: 80 °C (hold 1 min) to 310 °C at 4 °C/min (hold 1.5 min)
Rtx-200: 90 °C (hold 1 min) to 320 °C at 4 °C/min (hold 1.5 min)
Carrier GasHe, constant flow
Flow Rate:1.8 mL/min
Modulator Temp. Offset:25 °C
Second Dimension Separation Time:4 sec
Hot Pulse Time:1.2 sec
Cool Time between Stages:0.8 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:4 min
Ionization Mode:EI
Acquisition Range:45 to 550 amu
Spectral Acquisition Rate:100 spectra/sec
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesSee application note GNAN1338 for extraction and cleanup details. A 1.5 m length of the Rtx-200 column was trimmed from a 10 m column. Columns were connected with a Universal Press-Tight Connector (cat.# 20429). See chromatogram GC_FF1187 for full scale view.