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31-03-78
22-11-78
20 - 06 - 79
17- 1-80
24 6 80
3331
Ll%, M_J^O,
%
CG
'-jU^i
"X
L
STATION G
FIGURE 12. Evolution of the saturated hydrocarbons.
Examination of the chromatograms of the "saturated" fractions
shows a quantity of biogenic hydrocarbons of terrestrial origin which
is not negligible, and which is characteristic of the upstream stations
on the Aber which receive large quantities of deposits from the
soils. The distribution of n-alkanes is in fact typical of that observed
in the extracts from recent sediments in the predominance of
odd-carbon-numbered n-alkanes from n-C25 through n-C35 (Fig. 16).
These quantities of biogenic hydrocarbons present in the aliphatic
hydrocarbons are demonstrated in the ratio R29-31 developed
124