Detection of perchlorate and the soluble chemistry of martian soil at the Phoenix lander site.
Science
; 325(5936): 64-7, 2009 Jul 03.
Article
em En
| MEDLINE
| ID: mdl-19574385
ABSTRACT
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 approximately 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 approximately 5-centimeter-deep ice table showed no significant difference in soluble chemistry.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cátions
/
Percloratos
/
Marte
/
Ânions
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Science
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
Estados Unidos