Non-Polar Capillary GC Columns

Non-polar GC columns are made with the least selective of the GC stationary phases. They are commonly used to separate non-polar compounds (such as alkanes) that contain 1) only carbon and hydrogen atoms, and 2) only single bonds between carbon atoms. Elution order generally follows the boiling points of the analytes.
  • Interactions are primarily dispersive (van der Waals forces).
  • Phases with phenyl functional groups can also undergo a moderate amount of π-π interactions.
  • PTA-5 columns are specially-engineered to also allow strong basic interactions.
  • Phases with octyl functional groups also possess shape selectivity.