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Figure 1:
QuEChERS dSPE cleanup removes interferences that obscure target pesticides.
visit
www.restek.com/quechers4
QuEChERS dSPE Cleanup Assures Optimal Results for Pesticide Analysis
•
Improves integration and mass spectral matches.
•
Removes matrix interferences that obscure target analytes or cause ion suppression.
•
Protects GC inlet, and LC and GC columns from contamination.
allethrin
buprofezin
cis
-chlordane
trans
-chlordane
chlorpyrifos
cyprodinil
dacthal
diphenamid
endosulfan I
endosulfan II
fenthion
metolachlor
myclobutanil
oxyfluorfen
pendimethalin
pentachlorothioanisole
pirimiphos methyl
triadimefon
triadimenol
Without extract cleanup, hexadecanoic acid from the
matrix obscures peaks for all the following pesticides.
(example XIC chromatogram = endosulfan I)
Q-sep™ QuEChERS tubes easily
remove matrix interferences.
Effective...
GC_FF01125-27
Column
Rxi
®
-5Sil MS, 20 m, 0.18 mm ID, 0.18 μm (cat.# 43602)
Sample
Sweet potato spiked with pesticide mix and extracted with acetoni-
trile and Q-sep™ QuEChERS EN Method 15662 extraction salts
Injection
Inj. Vol.:
1.0 μL splitless (hold 1 min)
Liner:
Gooseneck splitless (4 mm) w/deact. wool (cat.# 22405)
Inj. Temp.:
250 °C
Oven
Oven Temp: 72.5 °C (hold 1 min) to 350 °C at 20 °C/min
Carrier Gas
He, constant flow
Flow Rate:
1.2 mL/min
A. No extract cleanup
B. Q-sep™ QuEChERS cleanup
Detector
MS
Mode:
Transfer Line Temp.: 300 °C
Analyzer Type:
TOF
Ionization Mode:
EI
Acquisition Range: 45-550 amu
Instrument
Agilent/HP6890 GC
Notes
A. Extract (without cleanup step) acidified with formic acid to pH 5
B. Extract with cleanup using Q-sep™ QuEChERS dSPE cleanup
tube (cat.# 26124) acidified with formic acid to pH 5.
Scan range: m/z 60, 73, 87, 129, 256 plotted