Reduction of nitrite and nitrate to ammonium on pyrite.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
Soujanya SingireddyDaniel R Strongin

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...Continue Reading

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Citations

Aug 21, 2013·Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life·Alexander D GordonDaniel R Strongin
Feb 3, 2016·Inorganic Chemistry·András StirlingMarco Bernasconi
Apr 12, 2021·The Science of the Total Environment·P DhakalC J Matocha
Jul 20, 2021·Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life·Michael O GaylorVytis Karanauskus
Jul 26, 2019·Environmental Science & Technology·Hejie QinPaul G Tratnyek

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