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GCxGC-TOFMS Analysis of Multi-Pesticide Standard Using Rxi-5Sil MS and Rtx-200

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.# 15124)
SampleCustom pesticide standard
Diluent:Acetonitrile
Conc.:500 pg/µL
Injection
Inj. Vol.:1.0 µL splitless (hold 1.0 min)
Liner:Premium 4 mm single taper w/wool (cat.# 23303.5)
Inj. Temp.:250 °C
Oven
Oven Temp.:Rxi-5Sil MS: 90 °C (hold 1.0 min) to 310 °C at 5 °C/min (hold 2.0 min)
Rtx-200: 95 °C (hold 1.0 min) to 315 °C at 5 °C/min (hold 2.0 min)
Carrier GasHe, corrected constant flow (2 mL/min)
Modulation
Modulator Temp. Offset:+20 °C
Second Dimension Separation Time:3 sec
Hot Pulse Time:0.9 sec
Cool Time between Stages:0.6 sec
DetectorMS
Mode:
Transfer Line Temp.:300 °C
Analyzer Type:TOF
Source Temp.:225 °C
Electron Energy:70 eV
Mass Defect:-20 mu/100 u
Ionization Mode:EI
Acquisition Range:45 to 550 amu
Spectral Acquisition Rate:100 spectra/sec
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesRtx-200 (cat.# 15124) is a 2 m column. A 1.3 m section was cut off and used as the second dimension column.