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The dependence of relative response factors on the carbon atom number related to naphthalene has been investigated in homologous series by using gas chromatography–mass spectrometry. Relative responses of some straight chain aliphatic  n -alkanes and their halogenated derivatives (chlorine, bromine and iodine) were compared in the experiments. Linear correlations were found between the molecular structures; i.e., the carbon atom number and relative molar response in current homologous series. In conclusion, mass spectrometric detection combined with gas chromatography was less sensitive to  n -alkanes than to their derivatives containing a chlorine, bromine or iodine atom. After  n -alkanes, mass spectrometric responses increase in the order of 1-chloroalkanes, 1-bromoalkanes and 1-iodoalkanes. These results are in accordance with electron ionization cross section data for  n -alkyl-derivatives. The relative molar responses of the individual CH 2  groups are between 0.171 and 0.178 in the homologous series. The increments of chlorine, bromine and iodine atoms to the relative molar responses are 0.081, 0.141 and 0.492, respectively.

The Determination of GC–MS Relative Molar Responses of Some n -Alkanes and their Halogenated Analogs