EFFECT OF HYDROXAMATE SIDEROPHORES ON FE RELEASE AND PB(II) ADSORPTION BY GOETHITE - EFFICIENCY AND SPECIFICITY OF HYDROXAMATE SIDEROPHORES COMPARED TO ALIPHATIC ACIDS
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dc.contributor.author | Kraemer S.M. | |
dc.contributor.author | Cheah S.F. | |
dc.contributor.author | Zapf R. | |
dc.contributor.author | Xu J. | |
dc.contributor.author | Raymond K.N. | |
dc.contributor.author | Sposito G. | |
dc.date.accessioned | 2021-01-09T05:51:37Z | |
dc.date.available | 2021-01-09T05:51:37Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=184837 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1999, , 19, 3003-3008 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22504 | |
dc.description.abstract | Hydroxamate siderophores are biologically-synthesized, Fe(III)-specific ligands which are common in soil environments. In this paper, we report an investigation of their adsorption by the iron oxyhydroxide, goethite; their influence on goethite dissolution kinetics; and their ability to affect Pb(II) adsorption by the goethite surface. The siderophores used were desferrioxamine B (DFO-B), a fungal siderophore, and desferrioxamine D1, an acetyl derivative of DFO-B (DFO-D1). Siderophore adsorption isotherms yielded maximum surface concentrations of 1.5 (DFO-B) or 3.5 (DFO-D1) μmol/g at pH 6.6, whereas adsorption envelopes showed either cation-like (DFO-B) or ligand-like (DFO-D1) behavior. Above pH 8, the adsorbed concentrations of both siderophores were similar. The dissolution rate of goethite in the presence of 240 μM DFO-B or DFO-D1 was 0.02 or 0.17 μmol/g hr, respectively. Comparison of these results with related literature data on the reactions between goethite and acetohydroxamic acid, a monohydroxamate ligand, suggested that the three hydroxamate groups in DFO-D1 coordinate to Fe(III) surface sites relatively independently. The results also demonstrated a significant depleting effect of 240 μM DFO-B or DFO-D1 on Pb(II) adsorption by goethite at pH > 6.5, but there was no effect of adsorbed Pb(II) on the goethite dissolution rate. | |
dc.title | EFFECT OF HYDROXAMATE SIDEROPHORES ON FE RELEASE AND PB(II) ADSORPTION BY GOETHITE - EFFICIENCY AND SPECIFICITY OF HYDROXAMATE SIDEROPHORES COMPARED TO ALIPHATIC ACIDS | |
dc.type | Статья |
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