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Eh STATUS OF LAKE SEDIMENT‐WATER SYSTEMS IN RELATION TO NITROGEN TRANSFORMATIONS 1
Author(s) -
Graetz Donald A.,
Keeney Dennis R.,
Aspiras Ruben B.
Publication year - 1973
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1973.18.6.0908
Subject(s) - anoxic waters , sediment , aeration , nitrate , nitrification , environmental science , nitrogen , denitrification , bottom water , environmental chemistry , hydrology (agriculture) , chemistry , geology , oceanography , geomorphology , geotechnical engineering , organic chemistry
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, NH 4 ‐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.