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Impurities in Commercial Cyclohexane on Rtx-DHA-100

ColumnRtx-DHA-100, 100 m, 0.25 mm ID, 0.50 µm (cat.# 10148)
Standard/SampleImpurities commonly found in commercial cyclohexane
Inj. Vol.:0.6 µL split (split ratio 100:1)
Liner:Topaz 4.0 mm ID Precision inlet liner w/wool (cat.# 23305)
Inj. Temp.:250 °C
Oven Temp.:35 °C (hold 15 min) to 65 °C at 5 °C/min (hold 5 min) to 200 °C at 20 °C/min (hold 2 min)
Carrier GasHe, constant flow
Flow Rate:2.4 mL/min
InstrumentAgilent 7890B GC
NotesSample is a synthetic blend prepared with impurities known to be present in cyclohexane at concentrations expected to be found in commercial samples.

Note that the distorted peak shape of 3,3-dimethylpentane is an example of "solvent effect." Solvent effect occurs when the analytical starting temperature is much lower than the boiling point of the solvent. When that occurs, the solvent peak affects the chromatography of compounds eluting near it. Peak shape for the compounds eluting prior to the solvent peak are usually distorted, while compounds eluting after the solvent peak will have somewhat increased retention.