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Fe(VI) in the form of ferrate salts, with FeO(sub 4)(sup 2-) anion, was studied for its spectral and oxidative properties, with the question of whether it might be a suitable analog of the Mars soil oxidant, proposed as a result of the Viking missions of the early 1970s.
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The Viking Gas Chromatograph Mass Spectrometer failed to detect organic matter on Mars, and both the Viking Labeled Release and Gas Exchange experiments indicated a highly oxidizing reactive soil on Mars surface.