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Hecht, M.H; Kounaves, S.P; Quinn, R.C; West, S.J; Young, S.M.M; Ming, D.W; Catling, D.C; Clark, B.C; Boynton, W.V; Hoffman, J; DeFlores, L.P; Gospodinova, K; Kapit, J; Smith, P.H
Science (American Association for the Advancement of Science), 07/2009, Letnik: 325, Številka: 5936Journal Article
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.
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