Amino acid diagenesis, organic carbon and nitrogen mineralization in surface sediments from the inner Oslofjord, Norway

Journal Article · Sat Jun 01 00:00:00 EDT 1991 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(91)90136-S· OSTI ID:6005455

Haugen, J E ^[1]; Lichtentaler, R ^[2]

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1. National Inst. of Public Health, Oslo (Norway)
2. Norwegian Inst. for Water Research, Oslo (Norway)

Total hydrolyzed amino acids (THAA), total organic carbon (TOC), and total nitrogen (TN) have been measured in an oxic and anoxic surface sediment from the inner Oslofjord. Downcore variations of these parameters are ascribed to both diagenesis and changes in organic matter supply, the latter being most important. These changes are most prominent in the anoxic sediment, which reflects the eutrophication history of the innermost part of the fjord. Downcore, THAA content decreased from 3.8 to 2.0 mg/g (salt-free dry weight) in the oxic sediment and from 22.3 to 3.8 mg/g in the anoxic sediment. Total amino acid nitrogen varied between 17 and 34% of total nitrogen in the oxic, and 25 and 54% in the anoxic, sediment. Organic carbon and organic nitrogen accumulation rates and depth integrated mineralization rates are about three times higher in the anoxic sediment than in the oxic sediment. Recycling of amino acids accounted for 4 to 12% of the total organic carbon and 13 to 40% of the total organic nitrogen regenerated in these sediments.

• OSTI ID: 6005455
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Vol. 55:6; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
AMINO ACIDS
HYDROLYSIS
NORWAY
GEOLOGIC DEPOSITS
SEDIMENT-WATER INTERFACES
MINERAL CYCLING
SEDIMENTS
DIAGENESIS
GEOCHEMISTRY
ANAEROBIC CONDITIONS
AQUATIC ECOSYSTEMS
CARBON COMPOUNDS
CARBON CYCLE
DRILL CORES
FIORDS
MINERALIZATION
NITROGEN COMPOUNDS
NITROGEN CYCLE
CARBOXYLIC ACIDS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DEVELOPED COUNTRIES
ECOSYSTEMS
ESTUARIES
EUROPE
INTERFACES
LYSIS
ORGANIC ACIDS
ORGANIC COMPOUNDS
SCANDINAVIA
SOLVOLYSIS
SURFACE WATERS
580000* - Geosciences