Kinetics of iron (II) oxidation in seawater of various pH
Roekens, E.J.; Van Grieken, R.E. (1983). Kinetics of iron (II) oxidation in seawater of various pH. Mar. Chem. 13: 195-202
In: Marine Chemistry. Elsevier: Amsterdam. ISSN 0304-4203; e-ISSN 1872-7581, more
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| Keywords |
Chemical elements > Metals > Transition elements > Heavy metals > Iron
Chemical reactions > Oxidation
Physics > Mechanics > Kinetics
Marine/Coastal |
| Authors | | Top |
- Roekens, E.J., more
- Van Grieken, R.E., more
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| Abstract |
The rate of iron(II) oxidation in the North Sea water of pH 5.5-10 in the range 10-25°C has been studied. The oxygenation rate depends linearly on the iron(II) and dissolved oxygen concentrations. The second-order dependence on (OH-), found by several investigators for synthetic solutions, was confirmed in seawater, but only for pOH>6.9. For pOH<5.9 the rate appeared to be independent of the pOH. In the intermediate range, pOH<5.9-6.9, corresponding to the natural pH of seawater, a first-order dependence on the pOH is obeyed. The important discrepancy in the literature between the second-order rate constant for NaCHO3 solutions and for seawater can be attributed predominantly to the incorrect assumption of a second-order pOH dependence in natural seawater. The results can be useful, for example, in predicting the effect of dumping acidic iron waste from the titanium-dioxide industry into the ocean. |
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