Carbon and hydrogen isotopic composition of bacterial methane in a shallow freshwater lake
Anoxic sediments from freshwater environments such as bogs, swamps, and lakes undergoing early diagenesis are frequently characterized by the formation of biogenic methane. Freshwater biogenic methanes exhibit carbon and hydrogen isotopic values strongly depleted in C-13 and deuterium relative to the respective values for carbon dioxide and formation water. The percentages of methane generated by fermentation and carbon dioxide reduction can be estimated by comparison of hydrogen isotopes in the formation water and methane. On the basis of these hydrogen isotope data, about 75% of the methane formation in Wurmsee comes from acetate reduction. Fermentation is thus the dominant although not exclusive process. Carbon dioxide reduction contributed the balance of the bacterial methane generated. 35 references, 5 figures, 1 table.
- Research Organization:
- Bundesanstalt fuer Geowissenschaften und Rohstoffe, Hanover, West Germany
- OSTI ID:
- 5371447
- Journal Information:
- Limnol. Oceanogr.; (United States), Vol. 29:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
METHANE
BIOSYNTHESIS
ISOTOPE RATIO
ACETATES
ANAEROBIC CONDITIONS
BACTERIA
CARBON 13
CARBON DIOXIDE
DEUTERIUM
DIAGENESIS
FEDERAL REPUBLIC OF GERMANY
LAKES
REDUCTION
SEDIMENTS
ALKANES
CARBON COMPOUNDS
CARBON ISOTOPES
CARBON OXIDES
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL REACTIONS
EUROPE
EVEN-ODD NUCLEI
HYDROCARBONS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MICROORGANISMS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
STABLE ISOTOPES
SURFACE WATERS
SYNTHESIS
WESTERN EUROPE
520100* - Environment
Aquatic- Basic Studies- (-1989)