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Effect of oxygen concentration on denitrification in freshwater sediment
Author(s) -
Trevors J. T.,
Starodub M. E.
Publication year - 1987
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620270711
Subject(s) - denitrification , denitrifying bacteria , anoxic waters , sediment , nitrate , environmental chemistry , chemistry , nitrogen , geology , paleontology , organic chemistry
The effect of different O 2 concentrations on denitrification in freshwater sediment was studied using the acetylene blockage technique. Denitrification occurred over a wide range of O 2 concentrations ranging from 10.1 to 0.33 μmol ml −1 in nitrate amended sediment. However, denitrifying activity was not observed in sediment incubated under similar conditions when NO 3 ‐was absent. These observations suggested that an anoxic environment or low O 2 concentrations were not required for denitrification to occur, if NO 3 ‐ was initially present in the sediment. Denitrification gradually decreased as the dissolved O 2 concentration in sediment increased to 0.25 μmol ml −1 . However, between 0.25 and 0.35 μmol ml −1 dissolved O 2 , denitrifying activity was higher than at the lower dissolved O 2 concentration (0.25 μmol ml −1 ).