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Atom exchange between aqueous Fe(II) and goethite: an Fe isotope tracer study
Robert M Handler1, Brian L Beard, Clark M Johnson
1Department of Civil and Environmental Engineering, University of Iowa, 4105 Seamans Center, Iowa City, Iowa 52242, USA.
Iron(II) rapidly exchanges with goethite iron, indicating coupled dissolution and growth at separate sites. This extensive mixing impacts contaminant sequestration and release in soils and groundwater.
Area of Science:
- Geochemistry
- Environmental Science
- Mineralogy
Background:
- Aqueous Fe(II) reactions with Fe(III) oxides involve sorption, electron transfer, and mineral transformation.
- Understanding Fe isotope exchange dynamics is crucial for predicting contaminant fate.
Purpose of the Study:
- To quantify the extent and rate of Fe isotope exchange between aqueous Fe(II) and goethite.
- To elucidate the mechanism governing Fe(II)-goethite interactions.
Main Methods:
- Utilized a 57Fe isotope tracer to monitor Fe exchange.
- Employed high-resolution transmission electron microscopy (HRTEM) for mineralogical analysis.
Main Results:
- Observed near-complete Fe isotope exchange between aqueous Fe(II) and goethite over 30 days.
- No significant phase transformation or change in goethite morphology was detected.
- HRTEM suggested potential minor goethite recrystallization.
Conclusions:
- Fe exchange suggests coupled growth and dissolution at distinct goethite sites, linked via bulk crystal conduction.
- Extensive Fe mixing in goethite has implications for heavy metal sequestration and contaminant reduction.
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