Occurrence of Nitrite in the Lough Neagh River System
| Autor: | R. J. Stevens, R. V. Smith, S. D. Lennox, R. H. Foy, L. C. Burns, C. Jordan, J. E. Cooper |
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| Rok vydání: | 1995 |
| Předmět: |
Hydrology
Environmental Engineering biology Range (biology) Agricultural pollution Nitrobacter Management Monitoring Policy and Law biology.organism_classification Pollution Substrate (marine biology) chemistry.chemical_compound chemistry Environmental science Nitrification Water quality Nitrite Waste Management and Disposal Nitrosomonas Water Science and Technology |
| Zdroj: | Journal of Environmental Quality. 24:952-959 |
| ISSN: | 1537-2537 0047-2425 |
| Popis: | The Lough Neagh catchment area covers about one-third of the land area of Northern Ireland. This report documents NO 2 - concentrations in the major rivers entering Lough Neagh, which are frequently in the range of 100 to 150 μg N L -1 and exceed the European Community (EC) water quality guide values. The contribution of land drainage to NO 2 - loads carried by these rivers was estimated to be about 40%. The remaining 60% of NO 2 - appears to originate from N transformations at the sediment-water interface of the river system. The available evidence suggests that NH 4 + originating from agricultural pollution provides the N substrate for nitrification by Nitrosomonas to NO 2 - . What is anomalous is why this NO 2 - is not further oxidized rapidly to NO 3 - by Nitrobacter. A possible mechanism is that the Nitrobacter is retarded by the presence of free ammonia concentrations that can be predicted to be present in the range of 65 to 76 μg N L -1 . |
| Databáze: | OpenAIRE |
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