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Column Comparison: Limit of Ethylene Glycol and Diethylene Glycol in Propylene Glycol
Peaks | tR (min) | Conc. (mg/mL) | |
---|---|---|---|
1. | Ethylene glycol![]() | 3.757 | 0.05 |
2. | Propylene glycol![]() | 4.422 | 2.0 |
3. | 2,2,2-Trichloroethanol (IS)![]() | 7.461 | 0.1 |
4. | Diethylene glycol![]() | 10.416 | 0.05 |

Column | Rxi-624Sil MS (see notes), 30 m, 0.32 mm ID, 1.80 µm (cat.# 13870) |
Sample | |
Diluent: | methanol |
Injection | |
Inj. Vol.: | 1 µL split (split ratio 10:1) |
Liner: | 5mm Single Gooseneck with Wool (cat.# 22973-200.1) |
Inj. Temp.: | 220 °C |
Oven | |
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 Gas | He, constant flow |
Linear Velocity: | 40 cm/sec |
Detector | FID @ 250 °C |
Instrument | Agilent/HP6890 GC |
Notes | Columns tested: Rxi-624Sil MS, ZB-624, and DB-624 |
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