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- Title
Stability of Fe- and Mn-(oxyhydr)oxides in Common Soil Dispersion Solutions.
- Authors
Manh, Phung N.; Moonis Ali Khan; Byong-Hun Jeon; Jae Gon Kim; Giehyeon Lee
- Abstract
Soil dispersion is a prerequisite process for the separation of metal oxides from bulk soil when magnetic separation is employed to enhance the efficiency for soil treatment. This study examined the stability of goethite, hematite, birnessite, and manganite in common dispersion solutions. The stability of pH in the oxide suspension decreased in the order carbonate (50 mM NaCO) > pyrophosphate (50 mM NaPO) > simple alkaline (1 mM NaOH) solutions regardless of the oxides. Dissolution of the four oxides was negligible in the carbonate and the simple alkaline solutions. In the pyrophosphate solutions, however, the oxides were subject to ligand-promoted dissolution by pyrophosphate ion. The extent of dissolution was highest for goethite followed by manganite, hematite, and birnessite. Dissolved Fe and Mn concentrations reached 68.3 and 4.1 μM for goethite and manganite suspensions, respectively, in 21 days with 5 mM pyrophosphate. Higher pyrophosphate concentrations (up to 150 mM) did not substantially affect the extent of ligand-promoted dissolution due to the limited surface sites of the oxides. The results of this study suggest that the carbonate solution would be more desirable than the simple alkaline or the pyrophosphate solution for soil dispersion in the presence of common Fe or Mn oxides.
- Subjects
IRON oxides; MANGANESE oxides; CARBONATES in soils; METALLIC oxides; PYROPHOSPHATES; GOETHITE; MANGANITE; HEMATITE
- Publication
Water, Air & Soil Pollution, 2011, Vol 217, Issue 1-4, p677
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-010-0619-2