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Calculation of retention indices and peak widths in temperature programmed gas-liquid chromatography

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Summary

Isothermal chromatographic measurements lead directly to ΔH ov and A (entropy term) of solutes, and three constants of an empirical relationship between peak width and column temperature. From the thermodynamic parameters ΔH ov and A retention temperatures have been computed by means of a theoretical model including temperature dependence of carrier gas viscosity, and subsequently retention times; programmed retention indices have been determined by linear and polynomial interpolations. By substituting the value of the calculated retention temperature in the above-mentioned relationship, peak width at half-height for a linear temperature may be estimated. Predicted retentions correlate with observed data, with a P-value ≤0.01; simulation accuracy is generally 6–10% for peak widths.

Retention indices of some organochlorine species, separated on an OV-101 capillary column, may differ by as much as 26 units depending on the method of calculation. Polynomial-calculated indices are more consistent with the retention index scheme, and have smaller standard deviations and better constancy at different heating rates.

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Messadi, D., Ali-Mokhnache, S. Calculation of retention indices and peak widths in temperature programmed gas-liquid chromatography. Chromatographia 37, 264–270 (1993). https://doi.org/10.1007/BF02278631

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