Bewaard in:
| Hoofdauteurs: | , |
|---|---|
| Formaat: | Dataset Open Access |
| Taal: | en |
| Gepubliceerd in: |
PANGAEA
1981
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| Onderwerpen: | |
| Online toegang: | https://doi.org/10.1594/PANGAEA.755437 |
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Inhoudsopgave:
- Composition of alkanes present in total plankton was determined at two stations in the Gulf of Riga and in six samples of recent bottom sediments collected in a cross-section extending from the Daugava River estuary to the Gotland Basin. C15 to C17 n-alkanes were dominant in the plankton, the highest content being that of n-C16 alkanes. Low values of the index of predominance of odd hydrocarbons over even ones (0.95 to 1.16) and presence of phytane and of a chromatogram "hump" caused by compounds that cannot be separated by gas-liquid chromatography indicate partial contamination of the plankton with petroleum hydrocarbons. In the low-temperature part of the spectrum, the main n-alkane peak in the upper layer of bottom sediments is due to n-C17 compounds, whereas in the high-temperature part the main peak is due to a series of odd (C23-C31) n-alkanes. It was shown that alkanes present in these sediments have mixed biogenic origin (marine + terrigenous), with different ratios of autochtonous and allochtonous components in different parts of the investigated section, and that they are practically devoid of petroleum hydrocarbons.