Other
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.1149b&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 3, pp.1149-1155
Other
6
Scientific paper
The solubility of siderite in acid, neutral, and alkaline medium was investigated. The experiments were performed as potentiometric titrations under two constant partial pressures of CO 2 (g). This yielded the following equilibrium constants at 25°C in a 1.0 M NaClO 4 medium (quoted errors through this work are given at 2 confidence level). 1. 1) The solubility constant of FeCO 3 (s) FeCO 3 ( s ) + 2 H + = Fe 2 + CO 2 ( g ) + H 2 O , with log K * s 0 = 7.59 ± 0.08. 2. 2) The formation constants for the two determined Fe(II) carbonate complexes: Fe 2+ CO 2 ( g ) + H 2 O = FeCO 3 ( aq ) + 2 H + , with log 11 = -12.9 ± 0.12 Fe 2+ + 2 CO 2 ( g ) + 2 H 2 O = Fe ( CO 3 ) 2 2- + 4 H + , with log 11 = - 28.4 ± 0.10. By extrapolation to infinite dilution, the following reaction equilibria are estimated for the infinite dilution standard state: FeCO 3 ( s ) = Fe 2+ + CO 3 2- , with log K sp = - 10.8 ± 0.2 Fe 2+ + CO 3 2- = FeCO 3 ( aq ), with log 11 = 5.5 ± 0.2 Fe 2+ + 2 CO 3 2- = Fe ( CO 3 ) 2 2- , with log 2 = 7.1 ± 0.2. The determined solubility constant is in fair agreement with previously derived solubility data. The identified complexes and their formation constants emphasize their importance in various anoxic waters. However, carbonate complex formation does not account for the supersaturation conditions with regard to siderite equilibrium observed in many other present-day environments.
Bruno Jordi
Stumm Werner
Wersin Paul
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