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Selectivity of stationary phases for the resolution of polycyclic aromatic hydrocarbons

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Summary

Relative retentions, heats and entropies of solution for 16 PAH in seven different stationary phases were measured under standard isobaric conditions using GC. The experimental conditions to obtain reproducible retention data at non-linear adsorption isotherms are discussed and standard conditions are recommended using the linear relationship between retention time and 1/log h (where h is the peak height). A linear relationship was established between the relative molar heats of solution and the number of carbon atoms in the PAH-molecule. This relationship is valid only for non-polar stationary phases. Certain effects of the isomeric structures of PAH are studied using the relative molar heats and entropies of solution. The latter function is very sensitive to the spherical form of a molecule. Different aspects of isomeric selectivity are discussed and it is concluded that the better way for resolving complex PAH-mixtures is rather an improvement in column efficiency than searching for new stationary phases.

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Authors and Affiliations

  1. Institute of Physical Chemistry of Academy of Sciences of Ukrainian SSR, pr. Nauki 97, 252028, Kiev, USSR

    L. S. Lysyuk & A. N. Korol

Authors
  1. L. S. Lysyuk
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  2. A. N. Korol
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Lysyuk, L.S., Korol, A.N. Selectivity of stationary phases for the resolution of polycyclic aromatic hydrocarbons. Chromatographia 10, 712–719 (1977). https://doi.org/10.1007/BF02263081

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