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Dissolution of Fe(III) (hydr) oxides by metal-EDTA complexes
Open accessAbstract
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.
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Kang, K., Schenkeveld, W. D. C., Biswakarma, J., Borowski, S. C., Hug, S. J., Hering, J. G., & Kraemer, S. M. (2019) · Environmental Science & Technology · doi:10.1021/acs.est.8b03909 · Cited by 44
Phytoextraction of Pb and Cu Contaminated Soil With Maize and Microencapsulated EDTA
Xie, Z., Wu, L., Chen, N., Liu, C., Zheng, Y., Xu, S., Li, F., & Xu, Y. (2012) · International Journal of Phytoremediation · doi:10.1080/15226510903390452 · Cited by 29
Metadata
- Authors
- Ngwack, B., & Sigg, L.
- Venue
- Geochimica et Cosmochimica Acta
- Publisher
- Elsevier BV
- Published
- 1997-03
- Volume
- 61
- Issue
- 5
- Pages
- 951-963
- ISSN
- 0016-7037 (ISSN-L)
- OpenAlex
- W1988766868
- Cited by
- 163
- References
- 0
- FWCI
- 5.15
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- Ngwack, B., & Sigg, L. (1997). Dissolution of Fe(III) (hydr) oxides by metal-EDTA complexes. Geochimica et Cosmochimica Acta. https://doi.org/10.1016/s0016-7037(96)00391-2
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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