Detection of Perchlorate and the Soluble Chemistry of Martian Soil at the Phoenix Lander Site

被引：847

作者：

Hecht, M. H. ^{[1
]}

Kounaves, S. P. ^{[2
]}

Quinn, R. C. ^{[3
]}

West, S. J. ^{[4
]}

Young, S. M. M. ^{[2
]}

Ming, D. W. ^{[5
]}

Catling, D. C. ^{[6
,7
]}

Clark, B. C. ^{[8
]}

Boynton, W. V. ^{[9
]}

Hoffman, J. ^{[10
]}

DeFlores, L. P. ^{[1
]}

Gospodinova, K. ^{[2
]}

Kapit, J. ^{[2
]}

Smith, P. H. ^{[9
]}

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[2] Tufts Univ, Dept Chem, Medford, MA 02155 USA

[3] NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA

[4] Invensys Proc Syst, Foxboro, MA 02035 USA

[5] NASA, Lyndon B Johnson Space Ctr, Astromat Res & Explorat Sci Directorate, Houston, TX 77058 USA

[6] Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England

[7] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA

[8] Space Sci Inst, Boulder, CO 80301 USA

[9] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[10] Univ Texas Dallas, Dept Phys, Richardson, TX 75080 USA

来源：

SCIENCE | 2009年 / 325卷 / 5936期

关键词：

CHEMICAL-COMPOSITION; MARS; SURFACE; SPECTROMETER; ORIGIN; ROCKS;

D O I：

10.1126/science.1172466

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The Wet Chemistry Laboratory on the Phoenix Mars Lander performed aqueous chemical analyses of martian soil from the polygon-patterned northern plains of the Vastitas Borealis. The solutions contained similar to 10 mM of dissolved salts with 0.4 to 0.6% perchlorate (ClO4) by mass leached from each sample. The remaining anions included small concentrations of chloride, bicarbonate, and possibly sulfate. Cations were dominated by Mg2+ and Na+, with small contributions from K+ and Ca2+. A moderately alkaline pH of 7.7 +/- 0.5 was measured, consistent with a carbonate-buffered solution. Samples analyzed from the surface and the excavated boundary of the similar to 5-centimeter-deep ice table showed no significant difference in soluble chemistry.

引用

页码：64 / 67

页数：4

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