| Abstract: | Cu, Ag and Cr concentrations in natural water may be lowered by mild chemical reduction involving ferric hydroxide-ferrous ion redox processes. V and Mo solubilities may be controlled by precipitation of ferrous vanadate or molybdate. Concentrations as low as 10-8.00 or 10-9.00 M are readily attainable for all these metals in oxygen-depleted systems that are relatively rich in Fe. Deposition of manganese oxides such as Mn3O4 can be catalyzed in oxygenated water by coupling to ferrous-ferric redox reactions. Once formed, these oxides may disproportionate, giving Mn4+ oxides. This reaction produces strongly oxidizing conditions at manganese oxide surfaces. The solubility of As is significantly influenced by ferric iron only at low pH. Spinel structures such as chromite or ferrites of Cu, Ni, and Zn, are very stable and if locally developed on ferric hydroxide surfaces could bring about solubilities much below 10-9.00 M for divalent metals near neutral pH. Solubilities calculated from thermodynamic data are shown graphically and compared with observed concentrations in some natural systems. ?? 1977. |
| Genre: | Article |
| ProdID: | 70010273 |
| Citation Author: | Hem, J. D. |
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| Citation End Page: | 538 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geochimica et Cosmochimica Acta |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Reactions of metal ions at surfaces of hydrous iron oxide; 1977; Article; Journal; Geochimica et Cosmochimica Acta; Hem, J. D. |
| Citation Start Page: | 527 |
| Citation Volume: | 41 |
| Citation Year: | 1977 |
| Type: | citation/reference |
| Text: | Reactions of metal ions at surfaces of hydrous iron oxide; 1977; Article; Journal; Geochimica et Cosmochimica Acta; Hem, J. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1977 00:00 -0600 |
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