Separation of Ethanol and Aromatics from Paraffins in Gasoline with GCxGC on Rtx-DHA-150 and Stabilwax

Injection
Column	Rtx-DHA-150 150 m, 0.25 mm ID, 1.00 µm (cat.# 10149)
	Stabilwax 1 m, 0.18 mm ID, 0.18 µm (cat.# 15118)

Standard/Sample	Gasoline
Conc.:	"Neat" (undiluted)
Inj. Vol.:	0.1 µL split (split ratio 200:1)
Liner:	4 mm split Precision liner w/semivolatiles wool (cat.# 21022-231.1)
Inj. Temp.:	275 °C
Oven
Oven Temp.:	Rtx-DHA-150: 40 °C (hold 1 min) to 245 °C at 1 °C/min Stabilwax: 45 °C (hold 1 min) to 250 °C at 1 °C/min
Carrier Gas	He, corrected constant flow (1.8 mL/min)
Modulation
Modulator Temp. Offset:	20 °C
Second Dimension Separation Time:	3 sec
Hot Pulse Time:	0.8 sec
Cool Time between Stages:	0.7 sec

Detector	FID @ 270 °C
Constant Column + Constant Make-up:	50 mL/min
Make-up Gas Type:	N₂
Data Rate:	200 Hz
Instrument	LECO GCxGC-FID
Notes	The Stabilwax column (cat.# 15118) is a 2 m column. A 1 m section was used as a second dimension column. IP deactivated guard column (cat.# 10102) is a 1 m column. A 0.2 m section was used as a transfer line from the second dimension column to the detector.

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