Pyrite-induced uv-photocatalytic abiotic nitrogen fixation

implications for early atmospheres and Life

Document identifier:
Access full text here:10.1038/s41598-019-51784-8
Keyword: Engineering and Technology, Mechanical Engineering, Aerospace Engineering, Teknik och teknologier, Maskinteknik, Rymd- och flygteknik, Atmosfärsvetenskap, Atmospheric science
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructure
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The molecular form of nitrogen, N2, is universally available but is biochemically inaccessible for life due to the strength of its triple bond. Prior to the emergence of life, there must have been an abiotic process that could fix nitrogen in a biochemically usable form. The UV photo-catalytic effects of minerals such as pyrite on nitrogen fixation have to date been overlooked. Here we show experimentally, using X-ray photoemission and infrared spectroscopies that, under a standard earth atmosphere containing nitrogen and water vapour at Earth or Martian pressures, nitrogen is fixed to pyrite as ammonium iron sulfate after merely two hours of exposure to 2,3 W/m 2 of ultraviolet irradiance in the 200–400 nm range. Our experiments show that this process exists also in the absence of UV, although about 50 times slower. The experiments also show that carbonates species are fixed on pyrite surface.


E. Mateo-Marti

Centro de Astrobiología (CSIC-INTA), Madrid, Spain
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S. Galvez-Martinez,

Centro de Astrobiología (CSIC-INTA), Madrid, Spain
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C. Gil-Lozano

Centro de Astrobiología (CSIC-INTA), Madrid, Spain
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María-Paz Zorzano Mier

Luleå tekniska universitet; Rymdteknik; Centro de Astrobiología (CSIC-INTA), Madrid, Spain
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