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Stability of Fe- and Mn-(oxyhydr)oxides in Common Soil Dispersion Solutions

Title
Stability of Fe- and Mn-(oxyhydr)oxides in Common Soil Dispersion Solutions
Author
전병훈
Keywords
Soil dispersion; Dispersion reagent; Fe oxides; Mn oxides; Pyrophosphate
Issue Date
2011-05
Publisher
SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Citation
WATER AIR AND SOIL POLLUTION,217(1-4), 677-687
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 Na2CO3) > pyrophosphate (50 mM Na4P2O7) > 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 mu M for goethite and manganite suspensions, respectively, in 21 days with 5 mM pyrophosphate. Higher pyrophosphate conce 0000005E ntrations (up to 150 mM) did not substantially affect the extent of ligand-promoted dissolutio 00000AEC n 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.
URI
http://link.springer.com/article/10.1007%2Fs11270-010-0619-2http://search.proquest.com/docview/862018226?accountid=11283
ISSN
0049-6979; 1573-2932
DOI
10.1007/s11270-010-0619-2
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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