Summary
A low cost home-made gas chromatographic system is described. With this system a precision of retention data is attained corresponding to a standard deviation of less than 0.03 index units for all types of hydrocarbons. A method has been found of preparing high resolution steel capillary columns in a reproducible way and with a homogeneous film. Adsorption of hydrocarbons on the column wall is negligible. With different instruments and different columns and operators, the reproducibility of retention data is in most cases considerably better than 0.1 index units. A list of retention indices of some 170 hydrocarbons (C4–C9) on squalane (nonpolar) and acetyltributylcitrate (polar) at 50 and 70°C is given. It is shown that the temperature coefficient of the retention index, which is now available with a higher precision, yields important structural information (e. g. cis-alkenes have a consistently higher dl/dT than trans-alkenes).
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Rijks, J.A., Cramers, C.A. High precision capillary gas chromatography of hydrocarbons. Chromatographia 7, 99–106 (1974). https://doi.org/10.1007/BF02269819
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DOI: https://doi.org/10.1007/BF02269819