Eh STATUS OF LAKE SEDIMENT‐WATER SYSTEMS IN RELATION TO NITROGEN TRANSFORMATIONS1
Open Access
- 1 November 1973
- journal article
- research article
- Published by Wiley in Limnology and Oceanography
- Vol. 18 (6) , 908-917
- https://doi.org/10.4319/lo.1973.18.6.0908
Abstract
Large Plexiglas columns were used to evaluate the changes in the forms and amounts of nitrogen in the bottom waters and sediments of three freshwater lakes during stratified (anoxic) and turnover (aerated) conditions. Sampling ports and permanently placed black Pt electrodes were installed so that water and sediment phases could be monitored. Sediment Eh declined rapidly to −150 to −250 mV and remained at this level irrespective of the oxygen concentration in the overlying water. During anoxic conditions, NH4‐N was released to the water at a relatively constant rate. Aeration affected rapid nitrification. Nitrate in the overlying water decreased with time, possibly due to diffusion into the highly reduced sediment and subsequent denitrification.Keywords
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