Mathematics – Logic
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987orli...17..251b&link_type=abstract
(International Society for the Study of the Origin of Life, Meeting, 5th, Berkeley, CA, July 21-25, 1986) Origins of Life (ISSN
Mathematics
Logic
4
Biological Evolution, Earth (Planet), Hydrogen, Hydroxides, Iron Compounds, Photosynthesis, Aqueous Solutions, Carbon Dioxide, Ferric Ions, Mineral Deposits, Near Ultraviolet Radiation, Photooxidation
Scientific paper
A possible origin of early hydrogen by UV-induced photoreduction of ferrous ions was investigated by measuring the rate of H2 formation from irradiated FeSO4 solutions as a function of pH and the range of UV sources. It was found that, in addition to the known reaction in acid solution which decreases in yield with increasing pH and requires far-UV light, there is an efficient reaction occurring between pH 6 and 9 which utilizes near-UV light (of a 200-W mercury arc lamp). This latter reaction is a linear function of both the concentration of Fe(2+) and the light intensity. These results support the suggestion of Braterman et al. (1983) that the near-UV-driven photooxidation of ferrous ions may be responsible for the origin of the banded iron formations on the early earth. The efficient photoreaction could also explain the source of reducing equivalents for CO2 reduction.
Borowska Zofia K.
Mauzerall David C.
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