| Abstract: | Oxalic acid retards the alteration of Mn3O4 to ??-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. |
| Genre: | Article |
| ProdID: | 70014403 |
| Citation Author: | Lind, C. J. |
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| Citation End Page: | 70 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 9 |
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| Citation Search Results Text: | Hausmannite (Mn3O4) conversion to manganite (??-MnOOH) in dilute oxalate solution; 1988; Article; Journal; Environmental Science and Technology; Lind, C. J. |
| Citation Start Page: | 62 |
| Citation Volume: | 22 |
| Citation Year: | 1988 |
| Type: | citation/reference |
| Text: | Hausmannite (Mn3O4) conversion to manganite (??-MnOOH) in dilute oxalate solution; 1988; Article; Journal; Environmental Science and Technology; Lind, C. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1988 00:00 -0600 |
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