By Giles M. Marion
This ebook explicitly investigates problems with astrobiological relevance within the context of chilly aqueous planetary geochemistry.
At the middle of the technical chapters is the FREZCHEM version, first and foremost built over decades through one of many authors to quantify aqueous electrolyte homes and chemical thermodynamics at subzero temperatures. FREZCHEM, of common relevance to biogeochemists and geochemical modelers, chilly planetary scientists, physicochemists and chemical engineers, is in this case utilized to the exploration of biogeochemical functions to sunlight structures our bodies in most cases, and to speculations concerning the limits for all times in chilly environments in particular.
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Additional resources for Cold Aqueous Planetary Geochemistry with FREZCHEM: From Modeling to the Search for Life at the Limits
13 represents the average value. For the top four datasets [high xCH4 (g) ], it was possible to derive independent equations (Fig. 4); for the bottom four datasets [low xCH4 (g) ] the data showed such scatter (Fig. 4). 3 Chemistries and Their Temperature and Pressure Dependence 47 Fig. 12. Comparison of two models for estimating the total gas pressure of mixed CH4 -CO2 gas hydrates. Reprinted from Marion et al. (2006) with permission Fig. 13. The relationship between the activity coeﬃcient of CH4 ·6H2 O and the mole fraction of CH4 (g) and temperature.
11. Solubility products of CH4 ·6H2 O and CO2 ·6H2 O at a hypothetical 1 atm total pressure. Reprinted from Marion et al. 49) where xi is the mole fraction, fi0 is the fugacity of the pure gas, and φ0i is the fugacity coeﬃcient at the temperature and total pressure (Pi0 ) of the solution (Pitzer 1995). See Fig. 14 in Duan et al. (1992b) for partial justification of this model for CH4 -CO2 gas mixtures. Another mixture problem is how to deal with mixed solid-phase gas hydrates. Both methane and carbon dioxide form structure I gas hydrates.
180 (Eq. 820. 4 equations and the simpler Eq. 58 give, within roundoﬀ error, identical results when used with Eq. 59. 0, which means that CO2 is preferentially incorporated into mixed gas hydrates. This is probably largely due to the greater solubility of CO2 (aq) compared to CH4 (aq). 4 and Eq. 58 will produce γCH4 ·6H2 O values > 1 at subzero temperatures (extrapolation of equations in Fig. 13). As equilibrium gas pressure drops (and temperature drops), the system approachs ideal behavior (see Eq.
Cold Aqueous Planetary Geochemistry with FREZCHEM: From Modeling to the Search for Life at the Limits by Giles M. Marion