Physics
Scientific paper
Aug 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gecoa..75.4601m&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 75, Issue 16, p. 4601-4610.
Physics
Scientific paper
The oxygenation kinetics of nanomolar concentrations of Fe(II) in aqueous solution have been studied in the absence and presence of millimolar concentrations of phosphate over the pH range 6.0-7.8. At each phosphate concentration investigated, the overall oxidation rate constant varied linearly with pH, and increased with increasing phosphate concentration. A model based on equilibrium speciation of Fe(II) was found to satisfactorily explain the results obtained. From this model, the rate constants for oxygenation of the Fe(II)-phosphate species FeH2PO4+, FeHPO4 and FePO4- have been determined for the first time. FePO4- was found to be the most kinetically reactive species at circumneutral pH with an estimated oxygenation rate constant of (2.2 ± 0.2) × 10 M-1 s-1. FeH2PO4+ and FeHPO4 were found to be less reactive with oxygen, with rate constants of (3.2 ± 2) × 10-2 M-1 s-1 and (1.2 ± 0.8) × 10-1 M-1 s-1, respectively.
David Waite T.
Mao Yanpeng
Ninh Pham A.
Rose Andrew L.
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