Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . ecologicalstudy00noaa Year: 1982 It should be noted that a sample taken at the same time and same place, but at a depth of 25 cm, shows an advanced stage of degradation, comparable to that observed in samples from the Aber Wrac'h at the same time. Compared with these subtidal sediments, oxidation degradation of the trapped crude in beach sands is slight and slow. This is seen in the infra-red spectra of the resins, where the absorption bands of the carbonyls are
Ecological study of the Amoco Ecological study of the Amoco Cadiz oil spill : report of the NOAA-CNEXO Joint Scientific Commission . ecologicalstudy00noaa Year: 1982 It should be noted that a sample taken at the same time and same place, but at a depth of 25 cm, shows an advanced stage of degradation, comparable to that observed in samples from the Aber Wrac'h at the same time. Compared with these subtidal sediments, oxidation degradation of the trapped crude in beach sands is slight and slow. This is seen in the infra-red spectra of the resins, where the absorption bands of the carbonyls are less marked (Fig. 26). KERDENIEl TREOMPAfl TREOMPAN KERDENIEL t—t r 3600 3200 2600 i r 1700 1600 1100 FIGURE 26. Infra-red spectrometry of the resins. CONCLUSION The samples studied fall into three categories : - subtidal sediments (Aber Wrac'h) ; - oil/water emulsions or 'chocolate mousse' ; - intertidal sediments (beach sands). In the slightly muddy sediments of fine sand in the stations lo- cated in the outer part of the Aber Wrac'h, where the marine character is pronounced, a decrease in global contents of extractable compounds is observed, whereas in those located in the upper part of the Aber, the decontamination process is slow, probably inhibited by the muddy nature of the sediments. 140
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