Abstract
Non-equilibrium coefficients ( C s and C m ) have been evaluated for iso-octane and n-octane on Porapak P at different temperatures in the range 130–180°. The reproducibility of the chromatographic parameters upon column conditioning has been investigated. An increase in the eddy diffusion contribution upon column conditioning is apparent. The stationary phase non-equilibrium coefficient for n-octane is affected due to a slight microstructural change in the polymer packing upon column condition, but that for iso-octane is unaltered under its existing large background effect. The temperature-sensitive and unusually high C s coefficients for iso-octane reflect a high activation energy of 17.6 kcal/mole. The unusual branched-chain peak broadening phenomenon recently observed on certain organic porous polymer column packings has been rationalized as being due to the effect of restricted intraparticle diffusion and the relative affinities of the various adsorbates for the adsorbent.
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