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Influence of Calcium Perchlorate on the Search for Martian Organic Compounds with MTBSTFA/DMF Derivatization.
He, Yuanyuan; Buch, Arnaud; Szopa, Cyril; Millan, Maëva; Freissinet, Caroline; Navarro-Gonzalez, Rafael; Guzman, Melissa; Johnson, Sarah; Glavin, Danny; Williams, Amy; Eigenbrode, Jennifer; Teinturier, Samuel; Malespin, Charles; Coscia, David; Bonnet, Jean-Yves; Lu, Pin; Cabane, Michel; Mahaffy, Paul.
Affiliation
  • He Y; Laboratoire Génie des Procédés et Matériaux, CentraleSupélec, University Paris-Saclay, Gif-sur-Yvette, France.
  • Buch A; Laboratoire Génie des Procédés et Matériaux, CentraleSupélec, University Paris-Saclay, Gif-sur-Yvette, France.
  • Szopa C; LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France.
  • Millan M; Department of Biology, Georgetown University, Washington, District of Columbia, USA.
  • Freissinet C; Space Science Exploration Division (Code 690), NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • Navarro-Gonzalez R; LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France.
  • Guzman M; Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Ciudad de México, Mexico.
  • Johnson S; LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France.
  • Glavin D; Department of Biology, Georgetown University, Washington, District of Columbia, USA.
  • Williams A; Space Science Exploration Division (Code 690), NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • Eigenbrode J; Space Science Exploration Division (Code 690), NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • Teinturier S; Department of Geological Sciences, University of Florida, Gainesville, Florida, USA.
  • Malespin C; Space Science Exploration Division (Code 690), NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • Coscia D; Space Science Exploration Division (Code 690), NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • Bonnet JY; Space Science Exploration Division (Code 690), NASA Goddard Space Flight Center, Greenbelt, Maryland, USA.
  • Lu P; LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France.
  • Cabane M; Department of Geological Sciences, University of Florida, Gainesville, Florida, USA.
  • Mahaffy P; Telespazio France, Toulouse, France.
Astrobiology ; 21(9): 1137-1156, 2021 09.
Article in En | MEDLINE | ID: mdl-34534003
ABSTRACT
N-tert-butyldimethylsilyl-N-methyltrifluoroacetamide (MTBSTFA), mixed with the solvent N,N-dimethylformamide (DMF), is used as a derivatizing reagent by the Sample Analysis at Mars (SAM) experiment onboard NASA's Curiosity rover and will soon be utilized by the Mars Organic Molecule Analyzer experiment onboard the ESA/Roscosmos Rosalind Franklin rover. The pyrolysis products of MTBSTFA, DMF, and the MTBSTFA/DMF mixtures, obtained at different temperatures, were analyzed. Two different pyrolysis modes were studied, flash pyrolysis and ramp pyrolysis (35°C/min), to evaluate the potential influence of the sample heating speed on the production of products in space chromatographs. The effect of the presence of calcium perchlorate on the pyrolysis products of MTBSTFA/DMF was also studied to ascertain the potential effect of perchlorate species known to be present at the martian surface. The results show that MTBSTFA/DMF derivatization should be applied below 300°C when using flash pyrolysis, as numerous products of MTBSTFA/DMF were formed at high pyrolysis temperatures. However, when an SAM-like ramp pyrolysis was applied, the final pyrolysis temperature did not appear to influence the degradation products of MTBSTFA/DMF. All products of MTBSTFA/DMF pyrolysis are listed in this article, providing a major database of products for the analysis of martian analog samples, meteorites, and the in situ analysis of martian rocks and soils. In addition, the presence of calcium perchlorate does not show any obvious effects on the pyrolysis of MTBSTFA/DMF Only chloromethane and TBDMS-Cl (chloro-tertbutyldimethylsilane) were detected, whereas chlorobenzene and other chlorine-bearing compounds were not detected. However, other chlorine-bearing compounds were detected after pyrolysis of the Murchison meteorite in the presence of calcium perchlorate. This result reinforces previous suggestions that chloride-bearing compounds could be reaction products of martian samples and perchlorate.
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Full text: 1 Database: MEDLINE Main subject: Mars / Extraterrestrial Environment Language: En Year: 2021 Type: Article
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Full text: 1 Database: MEDLINE Main subject: Mars / Extraterrestrial Environment Language: En Year: 2021 Type: Article