Changes

==Limitations due to contaminated samples==

==Limitations due to contaminated samples==

[[file:oiloil-and-oilsource-rock-correlations_fig8-19.png|left|thumb|{{figure number|15}}See text for explanation.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-19.png|left|thumb|{{figure number|15}}Gas chromatogram of saturated hydrocarbons from a source rock sample contaminated with bits of plastic.]]

In other cases, particularly in rock extracts, the sample may be contaminated. Plasticizers, for example, are common but are usually easy to recognize. [[:file:oiloil-and-oilsource-rock-correlations_fig8-19.png|Figure 15]] shows a gas chromatogram of saturated hydrocarbons from a source rock sample contaminated with bits of plastic. The largest peak is dioctylphthalate, derived from contact with the plastic.

In other cases, particularly in rock extracts, the sample may be contaminated. Plasticizers, for example, are common but are usually easy to recognize. [[:file:oiloil-and-oilsource-rock-correlations_fig8-19.png|Figure 15]] shows a gas chromatogram of saturated hydrocarbons from a source rock sample contaminated with bits of plastic. The largest peak is dioctylphthalate, derived from contact with the plastic.