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Reanalysis of the Viking results suggests perchlorate and organics at midlatitudes on Mars

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Navarro‐González, Rafael, Vargas, Edgar, de la Rosa, José, Raga, Alejandro C., McKay, Christopher P.·2010·Journal of Geophysical Research: Planets

DOI 10.1029/2010je003599

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Abstract

The most comprehensive search for organics in the Martian soil was performed by the Viking Landers. Martian soil was subjected to a thermal volatilization process to vaporize and break organic molecules, and the resultant gases and volatiles were analyzed by gas chromatography‐mass spectrometry. Only water at 0.1–1.0 wt% was detected, with traces of chloromethane at 15 ppb, at Viking landing site 1, and water at 0.05–1.0 wt% and carbon dioxide at 50–700 ppm, with traces of dichloromethane at 0.04–40 ppb, at Viking landing site 2. These chlorohydrocarbons were considered to be terrestrial contaminants, although they had not been detected at those levels in the blank runs. Recently, perchlorate was discovered in the Martian Arctic soil by the Phoenix Lander. Here we show that when Mars‐like soils from the Atacama Desert containing 32 ± 6 ppm of organic carbon are mixed with 1 wt% magnesium perchlorate and heated, nearly all the organics present are decomposed to water and carbon dioxide, but a small amount is chlorinated, forming 1.6 ppm of chloromethane and 0.02 ppm of dichloromethane at 500°C. A chemical kinetics model was developed to predict the degree of oxidation and chlorination of organics in the Viking oven. Reinterpretation of the Viking results therefore suggests ≤0.1% perchlorate and 1.5–6.5 ppm organic carbon at landing site 1 and ≤0.1% perchlorate and 0.7–2.6 ppm organic carbon at landing site 2. The detection of organics on Mars is important to assess locations for future experiments to detect life itself.

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Authors: Navarro‐González, R., Vargas, E., de la Rosa, J., Raga, A. C., & McKay, C. P.
Affiliations: Laboratorio de Química de Plasmas y Estudios Planetarios, Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria Mexico City Mexico
Universidad Nacional Autónoma de México (MX)
Ames Research Center (US)
ORCID: Raga, Alejandro C.
McKay, Christopher P.
Venue: Journal of Geophysical Research: Planets
Publisher: American Geophysical Union (AGU)
Published: 2010-12
Volume: 115
Issue: E12
ISSN: 0148-0227 (ISSN-L)
DOI: 10.1029/2010je003599
OpenAlex: W1970425118
Cited by: 384
References: 51
Citations by year: 2026: 15 · 2025: 18 · 2024: 17 · 2023: 24 · 2022: 22 · 2021: 24 · 2020: 27 · 2019: 28 · 2018: 36 · 2017: 20 · 2016: 24 · 2015: 23 · 2014: 31 · 2013: 26 · 2012: 25
FWCI: 13.23
Type: journal article
Language: en
Open access: bronze
doi.org
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor, 14 d)
Locations: Journal of Geophysical Research Atmospheres (publishedVersion)
Topics: Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Planetary Science and Exploration
Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Space Science and Extraterrestrial Life
Keywords: Viking landers, perchlorate, methyl chloride, dichloromethane, thermal volatilization, organic carbon, chemical kinetic modeling

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Reanalysis of the Viking results suggests perchlorate and organics at midlatitudes on Mars

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