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Extracted Ion Chromatograms and Spectra for Incurred Pesticides in Strawberries on Rxi-5Sil MS

ColumnRxi-5Sil MS, 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)
SampleStrawberries processed with QuEChERS sample preparation
QuEChERS Internal Standard Mix for GC/MS Analysis (cat.# 33267)
anthracene for quality control (cat.# 33264)
Conc.: captan incurred in store bought strawberries at 1,400 ppb and thiabendazole incurred in Amish strawberries at about 10 ppb
Inj. Vol.:1 µL splitless (hold 1.5 min)
Liner:Gooseneck Splitless (5mm) (cat.# 22973-200.1)
Inj. Temp.:250 °C
Oven Temp.:90 °C (hold 1.5 min) to 340 °C at 10 °C/min
Carrier GasHe, constant flow
Flow Rate:2 mL/min
Analyzer Type:TOF
Source Temp.:225 °C
Electron Energy:70 eV
Ionization Mode:EI
Acquisition Range:45-550 amu
Spectral Acquisition Rate:5 spectra/sec
InstrumentLECO Pegasus 4D GCxGC-TOFMS
NotesSample Preparation:
Sample: 10 g of homogenized strawberries, either Amish or store bought, and QuEChERS Internal Standard Mix for GC/MS Analysis (cat.# 33267).

Extraction: 10 mL acetonitrile added, 1 minute shake, then addition of Q-sep Q110 (cat.# 26235), 1 minute shake, centrifuge with Q-sep 3000 Centrifuge (cat.# 26230).

dSPE: Cleanup procedure according to EN 15662 method, add control standard anthracene (cat.# 33264) to 1 mL extract, add this to Q-sep Q210 dSPE tubes (cat.# 26215), shake, centrifuge.

Analysis: Extracted ion chromatograms of m/z 79 and 149 for captan and m/z 174 and 201 for thiabendazole.