The DOI matches its Crossref record; 49 of the 51 references it cites were found in a registry or an index.
Reanalysis of the Viking results suggests perchlorate and organics at midlatitudes on Mars
Open accessAbstract
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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“More recently, the Phoenix lander detected perchlorates in the martian surface, which could explain the nondetection of organics even if present (Navarro-González et al., 2010). Perchlorate is highly oxidizing at the elevated temperatures of pyrolytic experiments and so may have destroyed martian organics before detection.”
From The Astrobiology Primer v2.0 (2016) · cites this paper as Navarro-González et al., 2010
Citations
Cites
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Organic molecules in the Sheepbed Mudstone, Gale Crater, Mars
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Self-citation
Metadata
- 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)
- Venue
- Journal of Geophysical Research: Planets
- Publisher
- American Geophysical Union (AGU)
- Published
- 2010-12
- Volume
- 115
- Issue
- E12
- ISSN
- 0148-0227 (ISSN-L)
- 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
- 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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