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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) .
t r
3600 3200
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) .
KERDENIEL 18.10.78
treo:ip*:i 31.1.79
TREO'IPAN 28.3.79
KERDENIEL 28.3.79
In the slightly muddy sediments of fine sand in the stations located
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