Photo and thermal reactions of ferrous hydroxide

Details Photo and thermal reactions of ferrous hydroxide Photo and thermal reactions of ferrous hydroxide

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993oleb...23..105m&link_type=abstract

Origins of Life and Evolution of the Biosphere, Volume 23, Issue 2, pp.105-114

Computer Science

1

Scientific paper

The reactions of ferrous ion near neutral pH are of interest because of its known presence in the Archaean oceans. We have confirmed the long wavelength ultraviolet photochemical and the thermal reactions of ferrous hydroxide to form hydrogen. We have shown that a claim of the reduction of carbon dioxide to formaldehyde at neutral pH is mistaken. By the use of14C labelled compounds, we have found that less than 1 ppm of carbon dioxide is reduced to formaldehyde and less than 10 ppm of formate ion is so reduced. The thermal reaction to form hydrogen has a small activation energy of 7 kcal mole-1. We conclude that thermal and photochemical formation of hydrogen from ferrous ion in the Archaean ocean could be comparable at pH 8 9. At lower pH, toward its limit at pH 5, the photochemical reaction would predominate. Both the thermal and photochemical reactions are specific for ferrous hydroxide, being far slower for the phosphate (>50- and 7-fold) and the bicarbonate (2- and 30-fold) complexes.

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