Nitrous oxide production kinetics during nitrate reduction in river sediments

Water Research
Anniet M LavermanCéline L Roose-Amsaleg

Abstract

A significant amount of nitrogen entering river basins is denitrified in riparian zones. The aim of this study was to evaluate the influence of nitrate and carbon concentrations on the kinetic parameters of nitrate reduction as well as nitrous oxide emissions in river sediments in a tributary of the Marne (the Seine basin, France). In order to determine these rates, we used flow-through reactors (FTRs) and slurry incubations; flow-through reactors allow determination of rates on intact sediment slices under controlled conditions compared to sediment homogenization in the often used slurry technique. Maximum nitrate reduction rates (R(m)) ranged between 3.0 and 7.1microg Ng(-1)h(-1), and affinity constant (K(m)) ranged from 7.4 to 30.7mg N-NO(3)(-)L(-1). These values were higher in slurry incubations with an R(m) of 37.9microg Ng(-1)h(-1) and a K(m) of 104mg N-NO(3)(-)L(-1). Nitrous oxide production rates did not follow Michaelis-Menten kinetics, and we deduced a rate constant with an average of 0.7 and 5.4ng Ng(-1)h(-1) for FTR and slurry experiments respectively. The addition of carbon (as acetate) showed that carbon was not limiting nitrate reduction rates in these sediments. Similar rates were obtained for FTR and slurries w...Continue Reading

Citations

Mar 19, 2013·Journal of Contaminant Hydrology·A BoissonL Aquilina
May 2, 2014·Environmental Science and Pollution Research International·Yongqiang ZhaoXiaoyuan Yan
Sep 13, 2015·The Science of the Total Environment·Sen YanSarah Fansler
Feb 2, 2015·Water Research·Ehsan GhaneLarry C Brown
Oct 9, 2019·Environmental Science and Pollution Research International·Patteson Chula MwagonaHongxian Yu
Sep 26, 2017·Frontiers in Microbiology·Rong ChenJie Hou
Feb 24, 2010·Journal of Environmental Quality·Josette A GarnierGilles F Billen
Jul 21, 2017·Journal of Environmental Quality·M RaimonetA M Laverman
Feb 6, 2021·Environmental Science and Pollution Research International·Mauricio Faleschini, Américo Iadran Torres
Sep 8, 2018·Chemosphere·Shuhei MasudaOsamu Nishimura
Apr 27, 2021·Journal of Environmental Management·Shuhei MasudaOsamu Nishimura
May 16, 2021·Environmental Science and Pollution Research International·Mingzhu ZhangXuhao Wei

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