Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission ecologicalstudyo00noaa Year: 1982 i—r 3400 3000 1600 STATION 6 31-03-78 FIGURE 14. Infra-red spectrometry of the resins. by Tissot et al ; they were calculated for the earliest samples only 2(C29 + C31) R 29-31 = C28 + 2C30 + C32 The relationship shows that in this case, the n-C29 and n-C31 predominate. Where the value is over 1, the odd-numbered carbons pre- dominate. In Table 2, a compilation of these values for all the stations, it is seen that R is much high
Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission ecologicalstudyo00noaa Year: 1982 i—r 3400 3000 1600 STATION 6 31-03-78 FIGURE 14. Infra-red spectrometry of the resins. by Tissot et al ; they were calculated for the earliest samples only 2(C29 + C31) R 29-31 = C28 + 2C30 + C32 The relationship shows that in this case, the n-C29 and n-C31 predominate. Where the value is over 1, the odd-numbered carbons pre- dominate. In Table 2, a compilation of these values for all the stations, it is seen that R is much higher than 1 at Stations 6 and 8. Even in March 1978, this presence of natural compounds modified the distribution of hydrocarbons by family : - saturated hydrocarbon contents were low ,- - polar-compound contents (resins and asphaltenes) high. While the ratio of SAT/ARO decreased slightly, as at Stations 5 and 6 (Fig. 17), degradation of n-alkanes and isoprenoids (pristane and phytane) was observed throughout the period, showing clearly which polycyclic alkanes are most resistant to degradation. The chromatograms of the aromatic hydrocarbons have very marked profiles under photometric detection (FPD), and a persistence in the unresolved complex mixture (FID) (Fig. 16). Comparison of the results of the GPC with those of the high resolution MS undertaken on the re- ference samples of March 23, 1981 at Portsall, and the sampling taken 126
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