Abstract
Experiments were carried out to determine the effect of oxygen on denitrification, simultaneously in sediment and in a bacterial strain isolated from this sediment. Descriptions of the apparatus used are given. In sediment, denitrification was found to occur when the oxygen concentration increased to 5 mg l−1, but the activity was only 10% of that obtained under anaerobic conditions. The two first steps of denitrification measured in the sediment were less sensitive to oxygen. When the sediment was incubated in presence of 1,1 mg l−1 O2, the denitrification rate was never fully restored by returning it to anaerobic conditions.
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