Hausmannite (Mn3O4) conversion to manganite (γ-MnOOH) in dilute oxalate solution
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Abstract
Oxalic acid retards the alteration of Mn3O4 to γ-MnOOH during aging at pH 7.4 ?? 0.2 in well-aerated, abiotic suspensions that contain 4.4 ?? 10-3 M total Mn. In solutions of 1.25 ?? 10-3 M oxalate and greater, about 15% of the initial Mn3O4 altered to ??-MnOOH by day 10, and in solutions of 6.7 ?? 10-4 M oxalate, about 45% altered to ??-MnOOH by day 67. Although precipitation continued through day 365, the degree of conversion remained the same as at day 10 and day 67, respectively. In oxalate-free suspensions, the conversion was about 80% complete by day 67 and 100% by day 109. Oxalate complexed most of the dissolved divalent Mn, lowered the free Mn(II) and MnSO40 concentrations, but increased the total dissolved Mn. Steric hindrance of surface reactions by a suggested manganese oxalate layer on the Mn3O4 surface may explain the blockage of the oxidation cycle.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Hausmannite (Mn3O4) conversion to manganite (γ-MnOOH) in dilute oxalate solution |
| Series title | Environmental Science & Technology |
| DOI | 10.1021/es00166a006 |
| Volume | 22 |
| Issue | 1 |
| Year Published | 1988 |
| Language | English |
| Publisher | ACS Publications |
| Contributing office(s) | Toxic Substances Hydrology Program |
| Description | 9 p. |
| First page | 62 |
| Last page | 70 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |