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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 3

Table 3
- Microbial and hydrothermal aspects of ferric oxyhydroxides and ferrosic hydroxides: the example of Franklin Seamount, Western Woodlark Basin, Papua New Guinea

Reactions used to model the precipitation of low temperature iron and silica oxyhydroxides in the system Fe–Si–O–H shown in Fig. 7

Fe (OH)3 (fresh ferric hydroxide) (s) + 2H+ =
Fe2+ + 5/2 H2O + 1/4O2
Fe3(OH)8 (fresh ferrosic hydroxide) + 6H+ =
3Fe2+ + 7H2O + 1/2O2
3Fe(OH)3 (fresh ferric hydroxide) =
Fe3(OH)8 (fresh ferrosic hydroxide) + 1/2H2O + 1/4O2
Fe3(OH)8 (fresh ferrosic hydroxide) =
3Fe(OH)2 (fresh ferrous hydroxide) + H2O + 1/2O2
Fe(OH)2 (fresh ferrous hydroxide) + 2H+ = Fe2+ + 2H2O
SiO2 (amorphous) + 2H2O = Si(OH)4
FeSiO3 (ferrosilite) + 3H2O = Fe(OH)2 (fresh ferrous hydroxide) +
Si (OH)4
FeSiO3 (ferrosilite) + 10H2O + 1/2O2 =
Fe3(OH)8 (fresh ferrosic hydroxide) + 3Si(OH)4
FeSiO3 (ferrosilite) + H2O + 2H+ = Fe2+ + Si(OH)4

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