Thermodynamic stability of CoOOH and its coprecipitation with manganese
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Abstract
A precipitate of cobalt oxyhydroxides formed by bubbling oxygen through a dilute solution of Co(NO3)2 held at pH 9.0 and 25°C was aged for 23 months in contact with the original solution, with access to atmospheric oxygen. Co3O4 and CoOOH were identified in the precipitate by X-ray diffraction. Chemical equilibria involving these solids were evaluated by measurements of solution pH and Co2+ activities and by redox potential measurements and gave a ΔGcoOOH0 of −92.3 ± 0.5 kcal/mole. This value and other thermodynamic data show relative feasibility of hypothetical reaction steps and changes in reaction paths during automated coprecipitation titrations and subsequent aging of a precipitate that finally contained βMnOOH, MnO2 (birnessite) and CoOOH.
Suggested Citation
Hem, J., Roberson, C.E., Lind, C.J., 1985, Thermodynamic stability of CoOOH and its coprecipitation with manganese: Geochimica et Cosmochimica Acta, v. 49, no. 3, p. 801-810, https://doi.org/10.1016/0016-7037(85)90173-5.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Thermodynamic stability of CoOOH and its coprecipitation with manganese |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/0016-7037(85)90173-5 |
| Volume | 49 |
| Issue | 3 |
| Year Published | 1985 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 10 p. |
| First page | 801 |
| Last page | 810 |