Martian chemistry and the Viking labeled release experiments

Details Martian chemistry and the Viking labeled release experiments Martian chemistry and the Viking labeled release experiments

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978cosp.meetq....p&link_type=abstract

COSPAR, Plenary Meeting, 21st, Innsbruck, Austria, May 29-June 10, 1978, Paper. 20 p.

Physics

Chemical Reactions, Isotopic Labeling, Mars Atmosphere, Mars Surface Samples, Physical Chemistry, Viking Lander Spacecraft, Carbon Dioxide, Catalysts, Chemical Composition, Diurnal Variations, Formic Acid, Ph, Water Vapor

Scientific paper

The paper presents an analysis of four models for the production of radioactive gases in the Viking labeled release experiment, taking account of the atmospheric composition of Mars and its implications for the acidity of Martian soil. All the models involve reactions of formic acid, one of the species present in nutrient solution acidified by contact with the Martian soil. Two models - the production of gaseous formic acid and its dimer, and the production of formaldehyde - are clearly not correct. Of the remaining two, catalytic decarbonylation of formic acid and catalytic decomposition (or oxidation) of formic acid to carbon dioxide - the former explains the evolution of radioactivity and attenuation by successive injections in a manner consistent with Martian soil acidity.

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