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ASTM D5134 Rtx-DHA 50 Column Evaluation

GC_PC1318
PeaksConc.
(wt.%)
1.n-Heptane1.0
2.Toluene0.5
3.2,3,3-Trimethylpentane0.8
4.2-Methylheptane1.0
5.4-Methylheptane1.0
6.n-Octane1.0
ColumnRtx-DHA-50, 50 m, 0.20 mm ID, 0.50 µm (cat.# 10147)
SampleD5134 column evaluation mixture (DCG Partnership I, LTD)
Diluent:2-Methylpentane
Injection
Inj. Vol.:0.2 µL split (split ratio 200:1)
Liner:Premium 4.0 mm ID Precision liner w/wool (cat.# 23305.5)
Inj. Temp.:200 °C
Oven
Oven Temp.:35 °C (hold 60 min)
Carrier GasHe, constant pressure
Linear Velocity:23 cm/sec @ 35 °C
DetectorFID @ 250 °C
Make-up Gas Flow Rate:30 mL/min
Make-up Gas Type:N2
Hydrogen flow:40 mL/min
Air flow:370 mL/min
InstrumentAgilent 7890B GC
NotesThe Rtx-DHA 50 column meets all the ASTM D5134-13 method requirements for efficiency, resolution, and polarity.
Resolution (2-methylheptane/4-methylheptane) = 1.40 (method requirement ≥1.35)
Efficiency (n-C8) = 239,631 plates (method specification ≥ 225,000)
Column polarity = 0.5 (method 0.4±0.4)