Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . ecologicalstudy00noaa Year: 1982 1,700 cm-1; (Figure 6). The elemental analyses of the resins confirm this tendency toward oxidation over time (oxygen levels in March 1978 were %%%% ; in June 1980, 7 %%%%) . 31 03-78 22-11-78 20-06-79 17-01-80 24-06-80 I I 3400 30Q0 1700 1100 .1 700 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
Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . ecologicalstudy00noaa Year: 1982 1,700 cm-1; (Figure 6). The elemental analyses of the resins confirm this tendency toward oxidation over time (oxygen levels in March 1978 were %%%% ; in June 1980, 7 %%%%) . 31 03-78 22-11-78 20-06-79 17-01-80 24-06-80 I I 3400 30Q0 1700 1100 .1 700 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-C17 and phytane/n-C18 (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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