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Fast Detailed Hydrocarbons Analysis (DHA) on Rtx-DHA-100/Rtx-5 DHA

ColumnRtx-DHA-100, 100 m, 0.25 mm ID, 0.50 µm (cat.# 10148)
using Rtx-5 DHA tuning column* 2-5 m, 0.25 mm ID,
Standard/SampleDHA/oxygenates setup blend
Inj. Vol.:0.1 µL split (split ratio 150:1)
Liner:4 mm ID deactivated cup inlet liner (cat.# 20835 [replaced by 20836])
Inj. Temp.:250 °C
Carrier GasH2, constant flow
Flow Rate:3.62 mL/min
Linear Velocity:55 cm/sec
DetectorFID @ 300 °C
*Note that the exact length of the tuning column was determined experimentally based on the resolution of critical pairs as per method D6730-01 (reapproved 2011).

Oven Temp.
A: 35 °C
B: 5 °C (hold 8.32 min) (elute C5) to 48 °C at 22 °C/min (hold 26.32 min) (elute ethylbenzene) to 141 °C at 3.20 °C/min (elute C12) to 300 °C at 1 °C/min

A: Front end of DHA/oxygenates setup blend
C5 Efficiency: 586,825 plates
C5 k': 0.476
tert-Butanol skew: 2.10
Resolution: tert-Butanol/2-methylbutene-2: 5.39

AcknowledgementChromatogram courtesy of Neil Johansen, Inc., Aztec, New Mexico, in association with Envantage Analytical Software, Inc., Cleveland, Ohio.