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GCxGC-TOFMS Contour Plot Showing Potential Isobaric Interference with Acephate (m/z 136) in 1D Analysis

ColumnRxi-5ms 30 m, 0.25 mm ID, 0.25 µm (cat.# 13423)
  with Rxi guard column 1.0 m, 0.25 mm ID (cat.# 10029)
Rtx-200 1.0 m, 0.25 mm ID, 0.25 µm (cat.# 15124)
Sample505 Organohalide pesticide mix (cat.# 32024)
QuEChERS performance standards kit (cat.# 31152)
QuEChERS internal standard mix for GC-MS analysis (cat.# 33267)
Inj. Vol.:1.0 µL splitless (hold 1.0 min)
Liner:Premium 4 mm single taper (cat.# 23302.1)
Inj. Temp.:250 °C
Purge Flow:40 mL/min
Oven Temp.:Rxi-5ms: 70 °C (hold 1.0 min) to 330 °C at 8.0 °C/min (hold 6.5 min)
Rtx-200: 75 °C (hold 1.0 min) to 335 °C at 8.0 °C/min (hold 6.5 min)
Carrier GasHe, corrected constant flow (1.4 mL/min)
Modulator Temp. Offset:20 °C
Second Dimension Separation Time:2.00 sec
Hot Pulse Time:0.60 sec
Cool Time between Stages:0.40 sec
Transfer Line Temp.:320 °C
Analyzer Type:TOF
Source Temp.:225 °C
Electron Energy:70 eV
Mass Defect:-20 mu/100 u
Ionization Mode:EI
Acquisition Range:45-550 amu
Spectral Acquisition Rate:100 spectra/sec
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesAll column connections were made with an SGE SilTite µ-union.