An attempt was made in order to. develop mass spectrometry to the type analysis of the mixture normal- and iso-paraffins which have only one branch. The present method cannot be applied the type analysis of the mixture in which iso-paraffins have two or more branches.The present analysis consists in making use of the pattern coefficients of parent ions and the summation of them of C
nH
2n-type ions. The precision in terms of relative error of the analysis is better than10%, and the present method is applicable to the type analysis of the mixtures ranging from C
6 to C
11 paraffinic hydrocarbons.
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