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Universal system for liquid stationary phase classification on the basis of thermodynamical data

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Summary

Equations modifying Rohrschneider's relationship between ΔI and thermodynamical characteristics values are derived. Polarity in chromatography is discussed as a possibility of stationary phases or absorbents to enter into intermolecular interactions and is determined on the basis of the partial molar free energies of solution (ΔG) of six test substances. A simple method for the calculation of stationary phase polarity in terms of ΔG from retention indices and McReynolds constants is given. Equations are presented for the calculation of stationary phase selectivity utilizing ΔG data tabulated for selected test substances. The thermodynamical basis of selecting a reference phase for a unified system expressing the selectivity of stationary phases which can also be applied for adsorbents is suggested. The energy equivalent to an index unit, ΔGi.u., is discussed.

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Authors and Affiliations

  1. Institute of Organoelement Compounds, Academy of Sciences of the USSR, Vavilova, 28, Moscow, USSR

    R. V. Golovnya

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  1. R. V. Golovnya
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Golovnya, R.V. Universal system for liquid stationary phase classification on the basis of thermodynamical data. Chromatographia 12, 533–538 (1979). https://doi.org/10.1007/BF02265469

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  • DOI: https://doi.org/10.1007/BF02265469

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