Oxidation kinetics of Fe(II) in sea water
The oxidation of Fe(II) has been studied as a function of pH (5 to 9), temperature (5 to 45/sup 0/C), and salinity (0 to 35). The pseudo-first-order rate constant, k/sub 1/, in water and sea water was found to be a second degree function of pH over the pH range of 7.5 to 8.5 at 5/sup 0/C and 6.0 to 8.0 at 25/sup 0/C. The overall rate constant (k) was determined from 5 to 45/sup 0/C and S = 0 to 35. The results have been fit to an equation of the form with a standard error = 0.09. The energy of activation for the overall rate constant in water and sea water was 29 +/- 2 kJ mol/sup -1/. The equations are provided with this paper. The values of the rate constant for pure water (k/sub 0/) are in good agreement with literature data. The half times for sea water from some previous studies at a pH = 8.0 were slower than the authors results for Gulf Stream waters. Measurements on Biscayne Bay waters also yield slower half times apparently due to the presence of organic ligands that can complex Fe(II).
- Research Organization:
- Univ. of Miami, FL (USA)
- OSTI ID:
- 7024176
- Journal Information:
- Geochim. Cosmochim. Acta; (United States), Vol. 51:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
IRON IONS
CHEMICAL REACTION KINETICS
GEOCHEMISTRY
OXIDATION
SEAWATER
IRON COMPOUNDS
ACTIVATION ENERGY
BISCAYNE BAY
CHEMICAL COMPOSITION
GULF STREAM
PH VALUE
SALINITY
TEMPERATURE EFFECTS
ATLANTIC OCEAN
BAYS
CHARGED PARTICLES
CHEMICAL REACTIONS
CHEMISTRY
CURRENTS
ENERGY
HYDROGEN COMPOUNDS
IONS
KINETICS
OXYGEN COMPOUNDS
REACTION KINETICS
SEAS
SURFACE WATERS
TRANSITION ELEMENT COMPOUNDS
WATER
WATER CURRENTS
580400* - Geochemistry- (-1989)