Ammonium Ion Concentration in the Primitive Ocean

Details Ammonium Ion Concentration in the Primitive Ocean Ammonium Ion Concentration in the Primitive Ocean

Jan 1968

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968sci...159..423b&link_type=abstract

Science, Volume 159, Issue 3813, pp. 423-425

Mathematics

Logic

27

Scientific paper

If ion exchange on clay minerals regulated the cations in the primitive ocean as it does in the present ocean, the pH would have been 8 and the K+ concentration 0.01M. Since NH4{}+ and K+ are similar in their clay-mineral equilibria, the maximum NH4{}+ concentration in the primitive ocean would also have been 0.01M. An estimate of the minimum NH4{}+ concentration is 1 × 10-3M, based on the reversible deamination of aspartic acid and the assumption that aspartic acid is necessary for the origin of life. The rate of this nonenzymic deamination is rapid on the geological time scale.

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