Graduate Thesis Or Dissertation
 

Classification of stationary liquids in gas chromatography by infrared spectrophotometry

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  • A classification of stationary liquids by infrared spectroscopy to evaluate the polarity was made using the solvent effect technique. The infrared C-Cl absorption frequency shift was measured for solutions of 1-chlorohexane dissolved in each stationary phase. These frequency shifts were correlated to the relative retention times of 1-octene/n-octane, trans-2-octene/n-octane and 1,7-octadiene/n-octane on the same stationary phases, through Ecknig's equation log r₁,₂ = E AssC-C1 + F. The correlation coefficients obtained for 1-octene and 1,7-octadiene presented good reliability considering that several conceptual and experimental assumptions had to be made. Measurements of relative retention times of homologous series of n-alkanes for each stationary phase were correlated to the number of carbon atoms and the slopes calculated by linear regression. The order obtained by this way was compared to the order obtained by the evaluation of polarity.
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