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Pesticides in QuEChERS Extract of Sweet Potato on Rxi-5Sil MS

ColumnRxi®-5Sil MS, 20 m, 0.18 mm ID, 0.18 µm (cat.# 43602)
Samplesweet potato spiked with pesticide mix, extracted with acetonitrile and Q-sep™ Q110 QuEChERS extraction tube (cat.# 26213)
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.:72.5 °C (hold 1 min) to 350 °C at 20 °C/min
Carrier GasHe, constant flow
Flow Rate:1.2 mL/min
Transfer Line Temp.:300 °C
Analyzer Type:TOF
Source Temp.:225 °C
Electron Energy:70 eV
Mass Defect:-20 mu/100 u
Solvent Delay Time:3 min
Tune Type:PFTBA
Ionization Mode:EI
Scan Range:45-550 amu
Scan Rate:10 scans/sec
InstrumentLECO Pegasus III GC-TOFMS
A. extract (without cleanup step) acidified with formic acid to pH 5
B. extract with cleanup using Q-sep™ Q250 QuEChERS dSPE clean-up tube
(cat.# 26124), acidified with formic acid to pH 5

m/z plotted: 60, 73, 87, 129, 256