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  | isbn    = 0-89181-602-X

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In gas chromatography the distributions of ''n''-alkanes and isoprenoids are usually most useful. Of particular significance for correlations are the wax content (C₂₃₊), the Carbon Preference Index (CPI)<ref name=ch08r3>Bray, E., E., Evans, E., D., 1961, Distribution of n-paraffins as a clue to recognition of source beds; ''Geochimica et Cosmochimica Acta'', vol. 22, p. 2–15., 10., 1016/0016-7037(61)90069-2</ref> and the pristane-phytane (Pr/Ph) ratio. The following figures show gas chromatograms of the saturate fractions of several oils, illustrating the differences that can be observed in these compound classes as a result of differences in the source material.

In [[gas chromatography]] the distributions of ''n''-alkanes and isoprenoids are usually most useful. Of particular significance for correlations are the wax content (C₂₃₊), the Carbon Preference Index (CPI)<ref name=ch08r3>Bray, E., E., Evans, E., D., 1961, Distribution of n-paraffins as a clue to recognition of source beds; ''Geochimica et Cosmochimica Acta'', vol. 22, p. 2–15., 10., 1016/0016-7037(61)90069-2</ref> and the pristane-phytane (Pr/Ph) ratio. The following figures show gas chromatograms of the saturate fractions of several oils, illustrating the differences that can be observed in these compound classes as a result of differences in the source material.

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==See also==

==See also==

* [[How is GC/MS done?]]

* [[How is GC/MS done?]]

* [[Examples of oil correlations using GC/MS]]

* [[Examples of correlations using GC/MS]]

* [[Limitations of GC/MS]]

* [[Limitations of GC/MS]]

* [[Data obtained by high-performance liquid chromatography]]

* [[High-performance liquid chromatography]]

==References==

==References==