Abstract
In the present article several examples are given of the analysis of complex hydrocarbon mixtures by means of the combined gas chromatograph-mass spectrometer LKB-9000. Several methods, published in the literature or recommended as ASTM methods, were verified for group-type analysis on the mass spectrometric part of the apparatus. With fractions which can be divided into individual components by gas chromatography, the gas chromatograph-mass spectrometer enables the mass spectra of all the components to be determined without the necessity of isolating them from the mixture. The identification of seventeen individual hydrocarbons by one analysis of the fraction of aromatic hydrocarbons which have been isolated from a petroleum fraction boiling up to 200° was shown as an example. The high sensitivity of the LKB-9000 apparatus has also been utilized to obtain mass spectra of several hydrocarbons which have been unknown up to now and which have been prepared for this purpose in very low concentration by means of the methylene insertion reaction.
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