Abstract:
:A method was developed to follow bacterial nitrate reduction in freshwater sediments by using common high-performance liquid chromatographic equipment. The low detection limit (14 pmol) of the method enabled us to study concentration profiles and reaction kinetics under natural conditions. Significant nitrate concentrations (1 to 27 muM) were observed in the sediment of Lake Vechten during the nonstratified period; the concentration profiles showed a successive depletion of oxygen, nitrate, and sulfate with depth. The profiles were restricted to the upper 3 cm of the sediment which is rich in organics and loosely structured. Nitrate reduction in the sediment-water interface followed first-order reaction kinetics at in situ concentrations. Remarkably high potential nitrate-reducing activity was observed in the part of the sediment in which nitrate did not diffuse. This activity was also observed throughout the whole year. Estimates of K(m) varied between 17 and 100 muM and V(max) varied between 7.2 and 36 mumol cm day for samples taken at different depths. The diffusion coefficient of nitrate ([10 +/- 0.4] x 10 cm s) across the sediment-water interface was estimated by a constant-source technique and applied to a mathematical model to estimate the net nitrate reduction during the nonstratified period. In this period, observed nitrate reduction rates by the model, 0.2 to 0.4 mmol m day, were lower than those found for oxygen (27 mmol m day) and sulfate (0.4 mmol m day). During the summer stratification, nitrate was absent in the sediment and reduction could not be estimated by the model.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Hordijk CA,Snieder M,van Engelen JJ,Cappenberg TEdoi
10.1128/AEM.53.2.217-223.1987keywords:
subject
Has Abstractpub_date
1987-02-01 00:00:00pages
217-23issue
2eissn
0099-2240issn
1098-5336journal_volume
53pub_type
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