Abiotic ammonium formation in the presence of Ni-Fe metals and alloys and its implications for the Hadean nitrogen cycle
Open accessAbstract
Experiments with dinitrogen-, nitrite-, nitrate-containing solutions were conducted without headspace in Ti reactors (200 degrees C), borosilicate septum bottles (70 degrees C) and HDPE tubes (22 degrees C) in the presence of Fe and Ni metal, awaruite (Ni80Fe20) and tetrataenite (Ni50Fe50). In general, metals used in this investigation were more reactive than alloys toward all investigated nitrogen species. Nitrite and nitrate were converted to ammonium more rapidly than dinitrogen, and the reduction process had a strong temperature dependence. We concluded from our experimental observations that Hadean submarine hydrothermal systems could have supplied significant quantities of ammonium for reactions that are generally associated with prebiotic synthesis, especially in localized environments. Several natural meteorites (octahedrites) were found to contain up to 22 ppm Ntot. While the oxidation state of N in the octahedrites was not determined, XPS analysis of metals and alloys used in the study shows that N is likely present as nitride (N3-). This observation may have implications toward the Hadean environment, since, terrestrial (e.g., oceanic) ammonium production may have been supplemented by reduced nitrogen delivered by metal-rich meteorites. This notion is based on the fact that nitrogen dissolves into metallic melts.
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Native Fe±0 is an effective catalyst of N2 reduction under hydrothermal conditions.
“However, simulated hydrothermal conditions of 300°C and high pressure readily convert nitrite into NH3 [63], and under very mild conditions, FeS minerals can reduce N2 to NH3 at yields approaching 0.1 per cent [64], whereby native Fe±0 is also an effective catalyst of N2 reduction under hydrothermal conditions [65], recalling once again awaruite as an indicator of serpentinization [25].”
From Early bioenergetic evolution (2013) · cites this paper as [65]
The Results (Dinitrogen reduction; page not available) report that Fe⁰ was associated with the most NH₄⁺ production from N₂ among the tested metals at 200°C. The Discussion (Dinitrogen reduction; page not available) treats the surface-mediated mechanism as a hypothesis and notes that Fe⁰ oxidizes and its surface becomes passivated. The experiments therefore support Fe⁰-assisted N₂ reduction under hydrothermal conditions, but do not establish that Fe⁰ acts as a catalyst in those conditions. (LLM, conf=0.82)
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- Authors
- Smirnov, A., Hausner, D., Laffers, R., Strongin, D. R., & Schoonen, M. A.
- Affiliations
- Stony Brook University (US)
- Temple University (US)
- Corresponding author
- Smirnov, Alexander
- Venue
- Geochemical Transactions
- Published
- 2008-05-19
- Volume
- 9
- Issue
- 1
- Pages
- 5-5
- ISSN
- 1467-4866 (ISSN-L)
- PMC
- PMC2430951
- OpenAlex
- W2147833251
- Cited by
- 115
- References
- 9
- Citations by year
- 2026: 3 · 2025: 9 · 2024: 5 · 2023: 9 · 2022: 6 · 2021: 7 · 2020: 5 · 2019: 5 · 2018: 5 · 2017: 5 · 2016: 11 · 2015: 7 · 2014: 8 · 2013: 12 · 2012: 7
- FWCI
- 2.14
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- Geochemical Transactions (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- TUScholarShare (Temple University) (submittedVersion, cc-by)
- Funders
- National Aeronautics and Space Administration (NAG513438)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astro and Planetary Science
- Keywords
- nitrogen reduction, Fe-Ni alloys, awaruite, tetrataenite, submarine hydrothermal systems, meteorites, anatase, nitrogen nitrides, prebiotic synthesis, nitrogen molecule, nitrite, nitrate, temperature dependence
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