Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1021/es402179v
Titel (primär) No nitrification in lakes below pH 3
Autor Jeschke, C.; Falagán, C.; Knöller, K.; Schultze, M.; Koschorreck, M.
Quelle Environmental Science & Technology
Erscheinungsjahr 2013
Department SEEFO; CATHYD
Band/Volume 47
Heft 24
Seite von 14018
Seite bis 14023
Sprache englisch
UFZ Querschnittsthemen RU2;
Abstract Lakes affected by acid mine drainage (AMD) or acid rain often contain elevated concentrations of ammonium, which threatens water quality. It is commonly assumed that this is due to the inhibition of microbial nitrification in acidic water, but nitrification was never directly measured in mine pit lakes. For the first time, we measured nitrification by 15NH4Cl isotope tracer addition in acidic as well as neutral mine pit lakes in Spain and Germany. Nitrification activity was only detected in neutral lakes. In acidic lakes no conversion of 15NH4+ to 15NO3 was observed. This was true both for the water column as well as for biofilms on the surface of macrophytes or dead wood and the oxic surface layer of the sediment. Stable isotope analysis of nitrate showed 18O values typical for nitrification only in neutral lakes. In a comparison of NH4+ concentrations in 297 surface waters with different pH, ammonium concentrations higher 10 mg NH4–N L–1 were only observed in lakes below pH 3. On the basis of the results from stable isotope investigations and the examination of a metadata set we conclude that the lower limit for nitrification in lakes is around pH 3.
dauerhafte UFZ-Verlinkung
Jeschke, C., Falagán, C., Knöller, K., Schultze, M., Koschorreck, M. (2013):
No nitrification in lakes below pH 3
Environ. Sci. Technol. 47 (24), 14018 - 14023 10.1021/es402179v