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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
- Microbial and hydrothermal aspects of ferric oxyhydroxides and ferrosic hydroxides: the example of Franklin Seamount, Western Woodlark Basin, Papua New Guinea

Gibbs free energies of low temperature iron and silica oxyhydroxides in the system Fe–Si–O–H at 25°C and 1 bar

  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

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
 
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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