DISSOLUTION OF FE(III) (HYDR) OXIDES BY METAL-EDTA COMPLEXES
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dc.contributor.author | Nowack B. | |
dc.contributor.author | Sigg L. | |
dc.date.accessioned | 2020-12-16T04:09:08Z | |
dc.date.available | 2020-12-16T04:09:08Z | |
dc.date.issued | 1997 | |
dc.identifier | https://elibrary.ru/item.asp?id=274950 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 1997, , 5, 951-963 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/20943 | |
dc.description.abstract | The dissolution of Fe(III) (hydr)oxides (goethite and hydrous ferric oxide) by metal-EDTA complexes occurs by ligand-promoted dissolution. The process is initiated by the adsorption of metal-EDTA complexes to the surface and is followed by the dissociation of the complex at the surface and the release of Fe(III)EDTA into solution. The dissolution rate is decreased to a great extent if EDTA is complexed by metals in comparison to the uncomplexed EDTA. The rate decreases in the order EDTA # CaEDTA > PbEDTA > ZnEDTA > CuEDTA > Co(II)EDTA > NiEDTA. Two different rate-limiting steps determine the dissolution process: (1) detachment of Fe(III) from the oxide-structure and (2) dissociation of the metal-EDTA complexes. In the case of goethite, step 1 is slower than step 2 and the dissolution rates by various metals are similar. In the case of hydrous ferric oxide, step 2 is rate-limiting and the effect of the complexed metal is very pronounced. | |
dc.title | DISSOLUTION OF FE(III) (HYDR) OXIDES BY METAL-EDTA COMPLEXES | |
dc.type | Статья |
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