干旱区生态环境知识资源中心(Arid): Effects of Oxygen-Containing Salts on the Detection of Organic Biomarkers on Mars and in Terrestrial Analog Soils

Arid

DOI	10.1089/ast.2018.1888
	Effects of Oxygen-Containing Salts on the Detection of Organic Biomarkers on Mars and in Terrestrial Analog Soils
	Montgomery, Wren 1; Jaramillo, Elizabeth A.2,4; Royle, Samuel H.1; Kounaves, Samuel P.1,2; Schulze-Makuch, Dirk 3; Sephton, Mark A.1
通讯作者	Kounaves, Samuel P.
来源期刊	ASTROBIOLOGY
ISSN	1531-1074
EISSN	1557-8070
出版年	2019
卷号	19 期号:6 页码:711-721
英文摘要	The detection of chlorinated hydrocarbons by Curiosity on Mars has been attributed to the presence of unidentified indigenous organic matter. Similarly, oxychlorines on Earth have been proposed to be responsible for the apparent lack of organics in the Atacama Desert. The presence of perchlorate (ClO4-) poses a unique challenge to the measurement of organic matter due to the oxidizing power of oxychlorines during commonly used pyrolysis-gas chromatography-mass spectrometry (py-GC-MS) methods. Here, we show that perchlorates and other oxyanion salts inhibit the detection of organic compounds but that removing these problematic species prior to pyrolysis by using an optimal sample extraction duration and suitable ratios of water to sample mass enables analysis. We have characterized leached and unleached samples containing perchlorates from the Atacama Desert and have found that after leaching, the py-GC-MS chromatograms of the dried mineral residues show identifiable biomarkers associated with indigenous cyanobacteria. Samples which were pyrolyzed without leaching showed no detectable organic matter other than background siloxane and very weak or no trace of detectable polychlorinated benzenes. Dried sample residues remaining after leaching, the mineral matrix and water-insoluble organic matter, showed a strong organic response in all cases when analyzed by py-GC-MS. These residues are most likely the product of the pyrolysis of water-insoluble organics originally present in the samples. In addition, our results imply that previous soil analyses which contained high levels of oxyanions and concluded that organics were either not present or were present at extremely low levels should be reexamined.
英文关键词	Mars Organics Pyrolysis-gas chromatography-mass spectrometry Atacama Perchlorate Detection
类型	Article
语种	英语
国家	England ; USA ; Germany
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000469305500001
WOS关键词	ROCKNEST AEOLIAN DEPOSIT ; GALE CRATER ; ATACAMA DESERT ; MARTIAN SOIL ; PERCHLORATE ; MATTER ; COMBUSTION ; MOLECULES ; MUDSTONE ; NITRATE
WOS类目	Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS研究方向	Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214420
作者单位	1.Imperial Coll London, Dept Earth Sci & Engn, London, England; 2.Tufts Univ, Dept Chem, 62 Talbot Ave, Medford, MA 02115 USA; 3.Tech Univ Berlin, Astrobiol Grp, Ctr Astron & Astrophys, Berlin, Germany; 4.CALTECH, Jet Prop Lab, NASA, Pasadena, CA USA
推荐引用方式 GB/T 7714	Montgomery, Wren,Jaramillo, Elizabeth A.,Royle, Samuel H.,et al. Effects of Oxygen-Containing Salts on the Detection of Organic Biomarkers on Mars and in Terrestrial Analog Soils[J],2019,19(6):711-721.
APA	Montgomery, Wren,Jaramillo, Elizabeth A.,Royle, Samuel H.,Kounaves, Samuel P.,Schulze-Makuch, Dirk,&Sephton, Mark A..(2019).Effects of Oxygen-Containing Salts on the Detection of Organic Biomarkers on Mars and in Terrestrial Analog Soils.ASTROBIOLOGY,19(6),711-721.
MLA	Montgomery, Wren,et al."Effects of Oxygen-Containing Salts on the Detection of Organic Biomarkers on Mars and in Terrestrial Analog Soils".ASTROBIOLOGY 19.6(2019):711-721.