KINETIC AND EQUILIBRIUM FE ISOTOPE FRACTIONATION BETWEEN AQUEOUS FE(II) AND FE(III)
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dc.contributor.author | Welch S.A. | |
dc.contributor.author | Beard B.L. | |
dc.contributor.author | Johnson C.M. | |
dc.contributor.author | Braterman P.S. | |
dc.date.accessioned | 2021-11-28T04:25:36Z | |
dc.date.available | 2021-11-28T04:25:36Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=14193598 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 22, 4231-4250 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/32550 | |
dc.description.abstract | Equilibrium and kinetic Fe isotope fractionation between aqueous ferrous and ferric species measured over a range of chloride concentrations (0, 11, 110 mM Cl−) and at two temperatures (0 and 22°C) indicate that Fe isotope fractionation is a function of temperature, but independent of chloride contents over the range studied. Using 57Fe-enriched tracer experiments the kinetics of isotopic exchange can be fit by a second-order rate equation, or a first-order equation with respect to both ferrous and ferric iron. The exchange is rapid at 22°C, ∼60–80% complete within 5 seconds, whereas at 0°C, exchange rates are about an order of magnitude slower. Isotopic exchange rates vary with chloride contents, where ferrous-ferric isotope exchange rates were ~25 to 40% slower in the 11 mM HCl solution compared to the 0 mM Cl− (∼10 mM HNO3) solutions; isotope exchange rates are comparable in the 0 and 110 mM Cl− solutions. | |
dc.title | KINETIC AND EQUILIBRIUM FE ISOTOPE FRACTIONATION BETWEEN AQUEOUS FE(II) AND FE(III) | |
dc.type | Статья |
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