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Thermodynamic stability of CoOOH and its coprecipitation with manganese

Geochimica et Cosmochimica Acta

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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 ??GcoOOH0 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 ??MnOOH, MnO2 (birnessite) and CoOOH. ?? 1985.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Thermodynamic stability of CoOOH and its coprecipitation with manganese
Series title:
Geochimica et Cosmochimica Acta
Volume
49
Issue:
3
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
801
Last page:
810
Number of Pages:
10