Abstract
Measured pH and dissolved ferric iron concentration ([Fe(III) diss]) in contact with well-characterized hematite indicated an equilibrium with hematite immediately after synthesis, but [Fe(III) diss] increased with hydration time to be consistent with the predicted solubility of goethite or hydrous ferric oxide (HFO), hydrated analogues of hematite. X-ray diffraction did not detect structural modification of hematite after 190 days of hydration, but Mössbauer spectroscopy detected hydration that penetrated several crystalline layers. When the hematite suspension was diluted with water, solids were invariably identified as hematite, but [Fe(III)diss] and pH indicated an equilibrium with goethite or HFO. This is the first experimental confirmation that the interfacial hydration of anhydrous hematite results in higher solubility than predicted by bulk thermodynamic properties of hematite. Correspondence of the results with previously published measurements and implications for environmental chemistry of ferric oxides are also discussed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7303-7308 |
| Number of pages | 6 |
| Journal | Environmental Science and Technology |
| Volume | 41 |
| Issue number | 21 |
| DOIs | |
| State | Published - Nov 1 2007 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Environmental Chemistry
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Solubility of hematite revisited : Effects of hydration. / Jang, Je Hun; Dempsey, Brian A.; Burgos, William D.
In: Environmental Science and Technology, Vol. 41, No. 21, 01.11.2007, p. 7303-7308.Research output: Contribution to journal › Article
TY - JOUR
T1 - Solubility of hematite revisited
T2 - Effects of hydration
AU - Jang, Je Hun
AU - Dempsey, Brian A.
AU - Burgos, William D.
PY - 2007/11/1
Y1 - 2007/11/1
N2 - Measured pH and dissolved ferric iron concentration ([Fe(III) diss]) in contact with well-characterized hematite indicated an equilibrium with hematite immediately after synthesis, but [Fe(III) diss] increased with hydration time to be consistent with the predicted solubility of goethite or hydrous ferric oxide (HFO), hydrated analogues of hematite. X-ray diffraction did not detect structural modification of hematite after 190 days of hydration, but Mössbauer spectroscopy detected hydration that penetrated several crystalline layers. When the hematite suspension was diluted with water, solids were invariably identified as hematite, but [Fe(III)diss] and pH indicated an equilibrium with goethite or HFO. This is the first experimental confirmation that the interfacial hydration of anhydrous hematite results in higher solubility than predicted by bulk thermodynamic properties of hematite. Correspondence of the results with previously published measurements and implications for environmental chemistry of ferric oxides are also discussed.
AB - Measured pH and dissolved ferric iron concentration ([Fe(III) diss]) in contact with well-characterized hematite indicated an equilibrium with hematite immediately after synthesis, but [Fe(III) diss] increased with hydration time to be consistent with the predicted solubility of goethite or hydrous ferric oxide (HFO), hydrated analogues of hematite. X-ray diffraction did not detect structural modification of hematite after 190 days of hydration, but Mössbauer spectroscopy detected hydration that penetrated several crystalline layers. When the hematite suspension was diluted with water, solids were invariably identified as hematite, but [Fe(III)diss] and pH indicated an equilibrium with goethite or HFO. This is the first experimental confirmation that the interfacial hydration of anhydrous hematite results in higher solubility than predicted by bulk thermodynamic properties of hematite. Correspondence of the results with previously published measurements and implications for environmental chemistry of ferric oxides are also discussed.
UR - http://www.scopus.com/inward/record.url?scp=35948981756&partnerID=8YFLogxK
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U2 - 10.1021/es070535t
DO - 10.1021/es070535t
M3 - Article
C2 - 18044503
AN - SCOPUS:35948981756
VL - 41
SP - 7303
EP - 7308
JO - Environmental Science & Technology
JF - Environmental Science & Technology
SN - 0013-936X
IS - 21
ER -