| Abstract: | A combination of chemical and spectroscopic techniques were employed to gain further insight into the structural nature of sites at the ferrihydrite surface. The kinetics of iron isotopic exchange demonstrated that there are at least two types of iron sites in ferrihydrite. One population of sites, referred to as labile sites, approached iron isotopic equilibrium within 24 hr in 59Fe-NTA solutions, while the second population of sites, referred to as non-labile, exhibited a much slower rate of isotopic exchange. Labile sites are more reactive (with respect to iron isotopic exchange) because they have fewer neighboring Fe octahedra and are therefore bound less strongly to the ferrihydrite structure. The labile population of sites probably is composed of end sites of the dioctahedral chain structure of 2-line ferrihydrite, which is a subset of the entire population population of surface sites. -from Authors |
| Genre: | Article |
| ProdID: | 70017755 |
| Citation Author: | Rea, B. A.; Davis, J. A.; Waychunas, G. A. |
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| Citation End Page: | 34 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Clays and Clay Minerals |
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| Citation Number Of Pages: | 12 |
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| Citation Search Results Text: | Studies of the reactivity of the ferrihydrite surface by iron isotopic exchange and Mossbauer spectroscopy; 1994; Article; Journal; Clays and Clay Minerals; Rea, B. A.; Davis, J. A.; Waychunas, G. A. |
| Citation Start Page: | 23 |
| Citation Volume: | 42 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Studies of the reactivity of the ferrihydrite surface by iron isotopic exchange and Mossbauer spectroscopy; 1994; Article; Journal; Clays and Clay Minerals; Rea, B. A.; Davis, J. A.; Waychunas, G. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://ccm.geoscienceworld.org/content/42/1/23.citation |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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