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Biology Articles » Geobiology » Microbial and hydrothermal aspects of ferric oxyhydroxides and ferrosic hydroxides: the example of Franklin Seamount, Western Woodlark Basin, Papua New Guinea » Table 2
Table 2
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Gibbs free energies of low temperature iron and silica oxyhydroxides in the system Fe–Si–O–H at 25°C and 1 bar |
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| Sadiq and Lindsay, 1979 (ref. 39) kcal mole-1 |
Ponamperuma et al., 1967 (ref 25) kcal mole -1 |
Langmuir, 1969 (ref. 360) kcal mole-1 |
Winters and Buckley, 1986 (ref. 43) kcal mole-1 |
SUPCRT92, Johnson et al., 1991 (ref. 19) kcal mole -1 |
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| Fe3+ (aq) |
-4.02 |
-- |
-4.02 |
-- |
-4.12 |
| Fe2+ (aq) |
-21.80 |
-20.3 |
-21.8 |
-18.85 |
-21.87 |
| Fe(OH)2 (s) |
-117.584 |
-115.6 |
-117.584 |
-116.3 |
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| Fe(OH)3 (s) soil amorphous ferric iron |
-170.250 |
-- |
-- |
-- |
-- |
| Fe(OH)3 (s) aged amorphous ferric iron |
-170.163 |
-- |
-- |
-- |
-- |
| Fe(OH)3 (s) 4 day old amorphous ferric iron |
-169.250 |
-- |
-169.040 |
-- |
-- |
| Fe(OH)3 (s) freshly precipitated amorphous ferric iron |
Nature uncertain |
-166.0 |
-167.460 |
-166.5 |
-- |
| Fe3(OH)8 (s) freshly precipitated amorphous mixed-valence iron |
-459.220 |
-451.2 (nature uncertain) |
-- |
-- |
-- |
| H2O |
-56.687 |
-56.7 |
-56.688 |
-56.69 |
-56.688 |
| OH- |
-37.594 |
-- |
-37.594 |
-- |
-37.595 |
| SiO2 amorphous |
-203.02 |
-- |
-- |
-202.89 |
-202.89 (SiO2- nH20) |
| Ferrosilite |
-257.6 |
-- |
-- |
-267.16 |
-267.16 |
| Si(OH)4 (aq) |
-312.66 |
-- |
-- |
-- |
-312.6 (SiO2 [aq)] |
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