Prediction of retention times of polycyclic aromatic hydrocarbons and <Emphasis Type="Italic">n</Emphasis>-alkanes in temperature-programmed gas chromatography |
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Authors: | Fredrik Aldaeus Yasar Thewalim Anders Colmsjö |
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Institution: | (1) Department of Analytical Chemistry, Stockholm University, 106 91 Stockholm, Sweden |
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Abstract: | We have developed an iterative procedure for predicting the retention times of polycyclic aromatic hydrocarbons (PAHs) and
n-alkanes during separations by temperature-programmed gas chromatography. The procedure is based on estimates of two thermodynamic
properties for each analyte (the differences in enthalpy and entropy associated with movements between the stationary and
mobile phases) derived from data acquired experimentally in separations under isothermal conditions at temperatures spanning
the range covered by the temperature programs in ten-degree increments. The columns used for this purpose were capillary columns
containing polydimethylsiloxane-based stationary phases with three degrees of phenyl substitution (0%, 5%, and 50%). Predicted
values were mostly within 1% of experimentally determined values, implying that the method is stable and precise.
Figure Predicted values were mostly within 1 % of experimentally determined values, thus implying that the method is stable and precise |
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Keywords: | Gas chromatography Polycyclic aromatic hydrocarbons n-Alkanes Retention time Prediction |
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