TEMPERATURE DEPENDENCE OF GOETHITE DISSOLUTION PROMOTED BY TRIHYDROXAMATE SIDEROPHORES
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dc.contributor.author | Cocozza C. | |
dc.contributor.author | Tsao C.C.G. | |
dc.contributor.author | Cheah S.F. | |
dc.contributor.author | Kraemer S.M. | |
dc.contributor.author | Raymond K.N. | |
dc.contributor.author | Miano T.M. | |
dc.contributor.author | Sposito G. | |
dc.date.accessioned | 2021-04-14T04:57:38Z | |
dc.date.available | 2021-04-14T04:57:38Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=901824 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 3, 431-438 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27772 | |
dc.description.abstract | This article reports an investigation of the temperature dependence of goethite dissolution kinetics in the presence of desferrioxamine B (DFO-B), a trihydroxamate siderophore, and its acetyl derivative, desferrioxamine D1 (DFO-D1). At 25 and 40°C, DFO-D1 dissolved goethite at twice the rate of DFO-B, whereas at 55°C, the behavior of the two ligands was almost the same. Increasing the temperature from 25 to 55°C caused little or no significant change in DFO-B or DFO-D1 adsorption by goethite. A pseudo-first-order rate coefficient for dissolution, calculated as the ratio of the mass-normalized dissolution rate coefficient to the surface excess of siderophore, was approximately the same at 25 and 40°C for both siderophores. At 55°C, however, this rate coefficient for DFO-D1 was about half that for DFO-B. Analysis of the temperature dependence of the mass-normalized dissolution rate coefficient via the Arrhenius equation led to an apparent activation energy that was larger for DFO-B than for DFO-D1, but much smaller than that reported for the proton-promoted dissolution of goethite. A compensation law was found to relate the pre-exponential factor to the apparent activation energy in the Arrhenius equation, in agreement with what has been noted for the proton-promoted dissolution of oxide minerals and for the complexation of Fe3+ by DFO-B and simple hydroxamate ligands in aqueous solution. Analysis of these results suggested that the siderophores adsorb on goethite with a only single hydroxamate group in bidentate ligation with an Fe(III) center. | |
dc.title | TEMPERATURE DEPENDENCE OF GOETHITE DISSOLUTION PROMOTED BY TRIHYDROXAMATE SIDEROPHORES | |
dc.type | Статья |
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