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The chromatogram of the saturated hydrocarbons shows that the
n-paraffins had disappeared (Fig. 22) . Although there are divergences
FIGURE 22. Chromatogram of the saturated hydrocarbons taken
at the Brignogan station April 4, 1978.
in such parameters as metal and sulfur contents, the infra-red spectrum
definitely confirms that it is crude from the Amoco Cadiz. We
believe that these differences may be due to the fact that we were
dealing with oil sheets that had been treated to a greater or lesser
degree. These observations should be compared with those made by
Aminot et al. at the same time at a station just offshore from this
one, which showed an abnormal loss of dissolved oxygen. He explained
it as in-situ biodegradation of the hydrocarbons, which appears to be
the only logical explanation.
Distillation of the 340+ fractions shows little in the way of
interpretable differences (Table 6) . The sulfur and metal (nickel and
vanadium) contents show, by their stability, how important these compounds
are as pollution markers (Table 7) .
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TABLE 6. Simulated distillations of 340+ residues.
Z poids
discilUi