Buchwald, C., Santoro, A. E., McIlvin, M. R., and Casciotti, K. L.: Oxygen isotopic composition of nitrate and nitrite produced by nitrifying cocultures and natural marine assemblages, Limnol. Oceanogr., 57, 1361–1375, 2012.
Burgin, A. J. and Hamilton, S. K.: Have we overemphasized the role of denitrification in aquatic ecosystems? A review of nitrate removal pathways, Front. Ecol. Environ., 5, 89–96, 2007.
Burgin, A. J., Yang, W. H., Hamilton, S. K., and Silver, W. L.: Beyond carbon and nitrogen: how the microbial energy economy couples elemental cycles in diverse ecosystems, Front. Ecol. Environ., 9, 44–52, 2011.
Butterbach-Bahl, K., Baggs, E. M., Dannenmann, M., Kiese, R., and Zechmeister-Boltenstern, S.: Nitrous oxide emissions from soils: how well do we understand the processes and their controls?, Philos. T. R. Soc. B, 368, 20130122, https://doi.org/10.1098/rstb.2013.0122, 2013.
Callbeck, C. M., Mazzoli, A. P., Paulus, T. J., Frey, C., Bürgmann, H., Schuber, C. J., and Lehmann, M. F.: Seasonality of lake microbial denitrification and its sensitivity to climate warming, Nat. Microbiol., https://doi.org/10.1038/s41564-026-02349-9, 2026.
Casciotti, K. L.: Inverse kinetic isotope fractionation during bacterial nitrite oxidation, Geochim. Cosmochim. Ac., 73, 2061–2076, 2009.
Casciotti, K. L.: Nitrogen and oxygen isotopic studies of the marine nitrogen cycle, Annu. Rev. Mar. Sci., 8, 379–407, 2016.
Casciotti, K. L., Sigman, D. M., Hastings, M. G., Böhlke, J. K., and Hilkert, A.: Measurement of the oxygen isotopic composition of nitrate in seawater and freshwater using the denitrifier method, Anal. Chem., 75, 4905–4912, 2003.
Dalsgaard, T., Thamdrup, B., Farías, L., and Revsbech, N. P.: Nitrogen cycling in a deep-water oxygen-deficient zone of the Arabian Sea, Limnol. Oceanogr., 57, 1331–1346, 2012.
Deb, S. and Lewicka-Szczebak, D.: Simplified bacterial denitrification method using Stenotrophomonas nitritireducens for nitrite dual isotope analysis in low-concentration environmental samples, Front. Environ. Sci. 13, 1536882, https://doi.org/10.3389/fenvs.2025.1536882, 2025.
Deb, S., Espenberg, M., Well, R., Bucha, M., Jakubiak, M., Mander, Ü., Jędrysek, M.-O., and Lewicka-Szczebak, D.: N transformations in nitrate-rich groundwaters: combined isotope and microbial approach, Biogeosciences, 22, 5535–5556, https://doi.org/10.5194/bg-22-5535-2025, 2025.
Deb, S., Lewicka-Szczebak, D., and Rohe, L.: Microbial nitrogen transformations tracked by natural abundance isotope studies and microbiological methods: a review, Sci. Total Environ., 926, 172073, https://doi.org/10.1016/j.scitotenv.2024.172073, 2024.
Denk, T.R.A., Mohn, J., Decock, C., Lewicka-Szczebak, D., Harris, E., Butterbach-Bahl, K., Kiese, R., and Wolf, R.: The nitrogen cycle: A review of isotope effects and isotope modeling approaches, Soil Biol. Biochem., 105, 121–137, 2017.
Firestone, M. K. and Davidson, E. A.: Microbiological basis of NO and N
2O production and consumption in soil, in: Exchange of Trace Gases between Terrestrial Ecosystems and the Atmosphere, edited by: Andreae, M. O. and Schimel, D. S., Wiley, New York, 7–21,
https://hero.epa.gov/reference/92805/ (last access: 6 July 2026), 1989.
Grabb, K. C., Buchwald, C., Hansel, C. M., and Wankel, S. D.: A dual nitrite isotopic investigation of chemodenitrification by mineral-associated Fe(II) and its production of nitrous oxide, Geochim. Cosmochim. Ac., 196, 388–402, 2017.
Granger, J. and Wankel, S. D.: Isotopic overprinting of nitrification on denitrification as a ubiquitous and unifying feature of environmental nitrogen cycling, P. Natl Acad. Sci. USA, 113, E6391–E6400, 2016.
Heil, J., Vereecken, H., and Brüggemann, N.: A review of chemical reactions of nitrification intermediates and their role in nitrogen cycling and nitrogen trace gas formation in soil, Eur. J. Soil Sci., 67, 23–39, 2016.
Hu, J., Yao, S.J., Li, Y., Ren, H., Yang, K., and Liu, W.: Accurate isotopic analysis of nitrate and nitrite in freshwater: integration of ion exchange and bacterial denitrification methods, J. Anal. Atom. Spectrom., 41, 1774–1783, 2026.
Jiang, M., Koba, K., Ono, M., and Hayashi, K.: Improved Isotopic Analysis of Low-Concentration Freshwater Nitrite by Anion-Exchange Resin Enrichment and Azide Reduction, Anal. Chem. 98, 4, 2956–2967, 2026.
Jones, L. C., Peters, B., Pacheco, J. S. L., Casciotti, K. L., and Fendorf, S.: Stable isotopes and iron oxide mineral products as markers of chemodenitrification, Environ. Sci. Technol., 49, 3444–3452, 2015.
Kalvelage, T., Jensen, M. M., Contreras, S., Revsbech, N. P., Lam, P., Günter, M., LaRoche, J., Lavik, G., and Kuypers, M. M. M.: Nitrogen cycling driven by organic matter export in the South Pacific oxygen minimum zone, Nat. Geosci., 6, 228–234, 2013.
Karolewski, J. S., Sutherland, K. M., Hansel, C. M., and Wankel, S. D.: An isotopic study of abiotic nitrite oxidation by ligand-bound manganese (III), Geochim. Cosmochim. Ac., 293, 365–378, 2021.
Kraft, B., Strous, M., and Tegetmeyer, H. E.: Microbial nitrate respiration – genes, enzymes and environmental distribution, J. Biotechnol., 155, 104–117, 2011.
Lewicka-Szczebak, D., Lewicki, M. P., and Well, R.: N
2O isotope approaches for source partitioning of N
2O production and estimation of N
2O reduction – validation with the
15N gas-flux method in laboratory and field studies, Biogeosciences, 17, 5513–5537, https://doi.org/10.5194/bg-17-5513-2020, 2020.
Lewicka-Szczebak, D., Jansen-Willems, A., Müller, C., Dyckmans, J., and Well, R.: Nitrite isotope characteristics and associated soil N transformations, Sci. Rep., 11, 5008, https://doi.org/10.1038/s41598-021-83786-w, 2021.
Luther, G. W., Karolewski, J. S., Sutherland, K. M., Hansel, C. M., and Wankel, S. D.: The abiotic nitrite oxidation by ligand-bound manganese (III): the chemical mechanism, Aquat. Geochem., 27, 207–220, 2021.
Margalef-Marti, R., Bourbonnais, A., Knöller, K., Mayer, B., Altabet, M., and Sebilo, M.: Using N and O isotope fractionation for evaluating denitrification in aquatic systems, TrAC Trends Anal. Chem., 194, 118527, https://doi.org/10.1016/j.trac.2025.118527, 2026.
McIlvin, M. R. and Altabet, M. A.: Chemical conversion of nitrate and nitrite to nitrous oxide for nitrogen and oxygen isotopic analysis in freshwater and seawater, Anal. Chem., 77, 5589–5595, 2005.
Robinson, T. C., Latta, D. E., Notini, L., Schilling, K. E., and Scherer, M. M.: Abiotic reduction of nitrite by Fe(II): a comparison of rates and N
2O production, Environ. Sci. Process. Impacts, 23, 1531–1541, 2021.
Sebilo, M., Billen, G., Grably, M., and Mariotti, A.: Isotopic composition of nitrate-nitrogen as a marker of riparian and benthic denitrification at the scale of the whole Seine River system, Biogeochemistry, 75, 35–51, 2006.
Sebilo, M., Aloisi, G., Mayer, B., Perrin, E., Vaury, V., Mothet, A. and Laverman, A.M.: Controls on the isotopic composition of nitrite (
δ15N and
δ18O) during denitrification in freshwater sediments, Sci. Rep., 9, https://doi.org/10.1038/s41598-019-54014-3, 2019.
van Kessel, M. A. H. J., Speth, D. R., Albertsen, M., Nielsen, P. H., Op den Camp, H. J. M., Kartal, B., Jetten, M. S. M., and Lücker, S.: Complete nitrification by a single microorganism, Nature, 528, 555–559, 2015.
Vitousek, P. M., Aber, J. D., Howarth, R. W., Likens, G. E., Matson, P. A., Schindler, D. W., Schlesinger, W. H., and Tilman, D. G.: Human alteration of the global nitrogen cycle: sources and consequences, Ecol. Appl., 7, 737–750, 1997.
Ward, B. B., Devol, A. H., Rich, J. J., Chang, B. X., Bulow, S. E., Naik, H., Pratihary, A., and Jayakumar, A.: Denitrification as the dominant nitrogen loss process in the Arabian Sea, Nature, 461, 78–81, 2009.
Wrage, N., Velthof, G. L., van Beusichem, M. L., and Oenema, O.: Role of nitrifier denitrification in the production of nitrous oxide, Soil Biol. Biochem., 33, 1723–1732, 2001.
Zumft, W. G.: Cell biology and molecular basis of denitrification, Microbiol. Mol. Biol. Rev., 61, 533–616, 1997.