Effect of oxygen concentration on denitrification in freshwater sediment

✍ Scribed by Prof. Dr. J. T. Trevors; M. E. Starodub

• Publisher: John Wiley and Sons
• Year: 1987
• Tongue: English
• Weight: 357 KB
• Volume: 27
• Category: Article
• ISSN: 0233-111X
• DOI: 10.1002/jobm.3620270711

✦ Synopsis

The effect of different 0, concentrations on denitrification in freshwater sediment was studied using the acetylene blockage technique. Denitrification occurred over a wide range of 0, concentrations ranging from 10.1 t o 0.33 ymol ml-1 in nitrate amended sediment. However, denitrifying activity was not observed in sediment incubated under similar conditions when NO,was absent. These observations suggested t h a t a n anoxic environment or low 0, concentrations were not required for denitrification to occur, if NO,was initially present in the sediment. Denitrification gradually decreased as the dissolved 0, concentration in sediment increased to 0.25 ymol ml-l. However, between 0.25 and 0.35 pmol ml-' dissolved 02, denitrifying activity was higher than a t the lower dissolved 0, concentration (0.25 ymol ml-l).