NDLI: Reduction of Nitrite and Nitrate to Ammonium on Pyrite

Content Provider	Springer Nature Link
Author	Singireddy, Soujanya Gordon, Alexander D. Smirv, Alexander Vance, Michael A. Schoonen, Martin A. A. Szilagyi, Robert K. Strongin, Daniel R.
Copyright Year	2012
Abstract	An important constraint on the formation of the building blocks of life in the Hadean is the availability of small, activated compounds such as ammonia (NH$_{3}$) relative to its inert dinitrogen source. Iron-sulfur particles and/or mineral surfaces have been implicated to provide the catalytic active sites for the reduction of dinitrogen. Here we provide a combined kinetic, spectroscopic, and computational modeling study for an alternative source of ammonia from water soluble nitrogen oxide ions. The adsorption of aqueous nitrite (NO 2 − ) and nitrate (NO 3 − ) on pyrite (FeS$_{2}$) and subsequent reduction chemistry to ammonia was investigated at 22°C, 70°C, and 120°C. Batch geochemical and in situ Attenuated Total Reflection – Fourier Transform Infrared (ATR-FTIR) spectroscopy experiments were used to determine the reduction kinetics to NH$_{3}$ and to elucidate the identity of the surface complexes, respectively, during the reaction chemistry of NO 2 − and NO 3 − . Density functional theory (DFT) calculations aided the interpretation of the vibrational data for a representative set of surface species. Under the experimental conditions used in this study, we detected the adsorption of nitric oxide (NO) intermediate on the pyrite surface. NH$_{3}$ production from NO 2 − occurred at 70 and 120°C and from NO 3 − occurred only at 120°C.
Starting Page	275
Ending Page	294
Page Count	20
File Format	PDF
ISSN	01696149
Journal	Origins of Life and Evolution of Biospheres
Volume Number	42
Issue Number	4
e-ISSN	15730875
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-05-06
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Pyrite Nitrite Nitrate Ammonia Nitric oxide DFT ATR-FTIR Biochemistry Life Sciences Astrophysics and Astroparticles Astronomy, Observations and Techniques Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Medicine Ecology, Evolution, Behavior and Systematics Space and Planetary Science

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