SIDEROPHORE ADSORPTION TO AND DISSOLUTION OF KAOLINITE AT PH 3 TO 7 AND 22°C
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dc.contributor.author | Rosenberg D.R. | |
dc.contributor.author | Maurice P.A. | |
dc.date.accessioned | 2021-12-20T03:45:27Z | |
dc.date.available | 2021-12-20T03:45:27Z | |
dc.date.issued | 2003 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1329412 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2003, 67, 2, 223-229 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/33646 | |
dc.description.abstract | Siderophores are Fe(III)-specific ligands produced by many aerobic microorganisms under conditions of iron stress. This study examined adsorption of the commercial trihydroxamate siderophore, desferrioxamine B (DFO-B), to an iron-containing kaolinite (0.1 bulk wt.% Fe) and examined DFO-B effects on initial kaolinite dissolution and iron release rates. Adsorption experiments were conducted at pH 3 to 8 in 0.01-M NaClO4 in the dark and at 22°C; batch initial dissolution experiments were conducted to 96 h.The adsorption envelope (i.e., adsorption as a function of pH) of DFO-B on kaolinite was consistent with cation-like behavior, with adsorption increasing above kaolinite's pHpznpc of 4.9. DFO-B enhanced aluminum release from kaolinite at pH 3 to 7, relative to HNO3, which is consistent with the ligand's high binding affinity for Al. Correlation between DFO-B adsorption and aluminum release suggested a surface-controlled, ligand-promoted dissolution mechanism. DFO-B had no effect relative to HNO3 on silicon release at pH 3 and 5, but moderately enhanced silicon release at pH 7. DFO-B enhanced iron release from kaolinite, with dissolved iron concentrations in the 10-ppb range at 96-h reaction time. These results show that kaolinite may serve as a source of iron to aerobic microorganisms in iron-limited conditions and that siderophores may affect kaolinite dissolution and iron content. | |
dc.title | SIDEROPHORE ADSORPTION TO AND DISSOLUTION OF KAOLINITE AT PH 3 TO 7 AND 22°C | |
dc.type | Статья |
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