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• W2159572730 abstract "Nitrogen is an essential element for life. Specifically, fixed nitrogen (i.e. NH 3 , NH 4 + , NO x or N that is chemically bound to either inorganic or organic molecules and can be released by hydrolysis to form NH 3 or NH 4 + ) is useful to living organisms. Nitrogen on present-day Mars has been analysed only in the atmosphere. The inventory is a small fraction of the amount of nitrogen presumed to have been received by the planet during its accretion. Where is the missing nitrogen? Answering this question is crucial for understanding the probability of the origin and evolution of life on Mars, and for its future astrobiological exploration. The two main processes that could have removed nitrogen from the atmosphere include: (1) non-thermal escape of N atoms to space and (2) burial within the regolith as nitrates and ammonium salts. Nitrate would probably be stable in the highly oxidized surface soil of Mars and could have served as an NO 3 − sink. Such accumulations are observed in certain desert environments on Earth. Some NH 4 + nitrogen may also be fixed and stabilized in the soil by inclusion as a structural cation in the crystal lattices of certain phyllosilicates replacing K + . Analysis of the Martian soil for traces of NO 3 − and NH 4 + during future missions will provide important information regarding the nitrogen abundance on Mars. We hypothesize that Mars soil, as typical of extremely dry desert soils on Earth, is likely to contain at least some of the missing nitrogen as nitrate salts and some fixed ammonium bound to aluminosilicate minerals." @default.
• W2159572730 created "2016-06-24" @default.
• W2159572730 creator A5028350680 @default.
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• W2159572730 date "2003-07-01" @default.
• W2159572730 modified "2023-10-10" @default.
• W2159572730 title "Where is the nitrogen on Mars?" @default.
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• W2159572730 doi "https://doi.org/10.1017/s1473550403001599" @default.
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