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Studies of the reactivity of the ferrihydrite surface by iron isotopic exchange and Mossbauer spectroscopy

Clays and Clay Minerals

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, , and

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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

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Studies of the reactivity of the ferrihydrite surface by iron isotopic exchange and Mossbauer spectroscopy
Series title:
Clays and Clay Minerals
Volume
42
Issue:
1
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Clays and Clay Minerals
First page:
23
Last page:
34