Carbon monoxide on the primitive earth

Details Carbon monoxide on the primitive earth Carbon monoxide on the primitive earth

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..145v&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 1, p. 145-150.

Mathematics

Logic

5

Scientific paper

The reaction of CO + OH- in aqueous solution to give formate was studied as a carbon monoxide sink on the primitive earth and in the present ocean. The reaction is first order in OH- and first order in the molar CO concentration. The second order rate constant is given by log k(M-1 hr-1) = 15.83-4886/T between 25°C and 60°C. Using the solubility of CO in sea water, and assuming a pH of 8 for a primitive ocean of the present size, the halflife of CO in the atmosphere is calculated to be 12 × 106 yr at 0°C and 5.5 × 104 yr at 25°C. Three other CO sinks would have been important in the primitive atmosphere: CO + H2 --> H2CO driven by various senergy sources, CO + OH --> CO2 + H, and the Fischer-Tropsch reaction of CO + H2 --> hydrocarbons, etc. It is concluded that the lifetime of a CO atmosphere would have been very short on the geological time scale although the relative importance of these four CO sinks is difficult to estimate. The CO + OH- reaction to give formate is a very minor CO sink on the earth at the present time.

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