Abstract
In order to determine the retention indices of compounds in programmed-temperature gas chromatography as precisely as possible, a series of hydrocarbons having successive carbon numbers is mixed with the solution. The addition of reference products to complex mixtures often results in peak interferences; by adding paraffins with even carbon numbers only, the risk of overlapping of peaks diminishes at the expense of precision. This paper describes a method of improved linear interpolation which gives reliable results of the same accuracy as would have been obtained if the whole series of alkanes had been added. Computer programs have been designed for calculations based on linear as well as improved linear interpolations in on-line and off-line applications.
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