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Column Comparison: Limit of Ethylene Glycol and Diethylene Glycol in Propylene Glycol

PeakstR (min)Conc.
1.Ethylene glycol3.7570.05
2.Propylene glycol4.4222.0
3.2,2,2-Trichloroethanol (IS)7.4610.1
4.Diethylene glycol10.4160.05
ColumnRxi-624Sil MS (see notes), 30 m, 0.32 mm ID, 1.80 µm (cat.# 13870)
Inj. Vol.:1 µL split (split ratio 10:1)
Liner:5mm Single Gooseneck with Wool (cat.# 22973-200.1)
Inj. Temp.:220 °C
Oven Temp.:100 °C (hold 4 min) to 120 °C at 50 °C/min (hold 10 min) to 220 °C at 50 °C/min (hold 6 min)
Carrier GasHe, constant flow
Linear Velocity:40 cm/sec
DetectorFID @ 250 °C
InstrumentAgilent/HP6890 GC
NotesColumns tested: Rxi-624Sil MS, ZB-624, and DB-624