A High‐Precision Analytical Technique for Dissolved N <sub>2</sub> Isotopes in Aquatic Systems: Biogeochemical Applications and Determination of Solubility Equilibrium Isotope Effects
Our new method allows for high-precision measurements of the isotopic composition of dissolved N<sub>2</sub> and Ar, and dissolved N<sub>2</sub>/Ar and Kr/N<sub>2</sub> ratios, within the same sample. Pairing measurements of N<sub>2</sub> with inert gases facilitates the quantification of excess N<sub>2</sub> from biogeochemical sources and its isotopic composition. This method allows for a wide range of applications in marine, coastal, and freshwater environments to characterize and quantitatively constrain potential nitrogen-cycling sources and pathways and to differentiate between physical and biological isotope signals in these systems.
Authors
- Katelyn McPaul (ORCID: https://orcid.org/0000-0001-9941-2969)
- Scott D. Wankel (ORCID: https://orcid.org/0000-0002-7683-0225)
- Alan Seltzer (ORCID: https://orcid.org/0000-0003-2870-1215)
Institutions
- Woods Hole Oceanographic Institution (US)
Publication Details
- Journal
- Rapid Communications in Mass Spectrometry
- Published
- 2025-06-17
- DOI
- https://doi.org/10.1002/rcm.10094
- Citations
- 1
- Primary Topic
- Marine and coastal ecosystems
- Type
- article
- Field-Weighted Citation Impact
- 1.79
Funders
- National Science Foundation
- Andrew W. Mellon Foundation