. Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . 31 03-78 22-11-78 20 06-79 17-01-80 24-06-80 3400 3000 1700 1100 700 cm 1600 Station 5 - FIGURE 6. Infra-red spectrometry of the resins. The distribution of saturated hydrocarbons determined by gas phase chromatography (Fig. 7) demonstrates the evolution which led to the degradation of the n-alkanes ( % to %) to n-C30 (Table 1). It should be noted that by March 31, 1978, this degradation appears to have begun. Thus there was an increase in the ratios of pristane/n-Cl7 and phytane/n
. Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . 31 03-78 22-11-78 20 06-79 17-01-80 24-06-80 3400 3000 1700 1100 700 cm 1600 Station 5 - FIGURE 6. Infra-red spectrometry of the resins. The distribution of saturated hydrocarbons determined by gas phase chromatography (Fig. 7) demonstrates the evolution which led to the degradation of the n-alkanes ( % to %) to n-C30 (Table 1). It should be noted that by March 31, 1978, this degradation appears to have begun. Thus there was an increase in the ratios of pristane/n-Cl7 and phytane/n-Cl8 (Table 1). The isoprenoids degraded less easily than the n-alkanes (TISSOT and al.), but by June 1980 these compounds could no longer be detected. As degradation advanced, the contribution of the biogenic hydrocarbons increased, and n-alkanes of odd carbon numbers between n-C25 and n-C35 -- characteristic of the cuticle waxes of higher plants (Eglington and Hamilton - 1963) — appeared, confirming the ter- restrial contribution to the contents of organic matter in the sediments. Moreover, the disappearance of the n-paraffins points up a relative enrichment in the unresolved complex mixture of the isoalkane and cyclo- alkane compounds, and generally in the compounds around n-C30. It was possible to demonstrate these last compounds by GPC/MS by measuring the masses : m/e 217 being characteristic of the tetracyclic 117
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