Journal article
Natural organic matter inhibits Ni stabilization during Fe(II)-catalyzed ferrihydrite transformation
The Science of the total environment, Vol.755(Pt 2), pp.142612-142612
02/10/2021
DOI: 10.1016/j.scitotenv.2020.142612
PMID: 33045610
Abstract
Trace metals, such as nickel (Ni), are often found associated with ferrihydrite (Fh) in soil and sediment and have been shown to redistribute during Fe(II)-catalyzed transformation of Fh. Fe(II)-catalyzed transformation of Fh, however, is often inhibited when natural organic matter (NOM) is associated with Fh. To explore whether NOM affects the behavior of Ni during Fe(II)-catalyzed transformation of Fh, we tracked Ni distribution, Fe atom exchange, and mineral transformation of Fh and Fh coprecipitated with Suwannee River natural organic matter (SRNOM-Fh). As expected, in the absence of Fe(II), Fh and SRNOM-Fh did not transform to secondary Fe minerals after two weeks. We further observed little difference in Ni adsorption on SRNOM-Fh compared to Fh. In the presence of Fe(II), however, we found that Ni associated with SRNOM-Fh was more susceptible to acid extraction than Fh. Specifically, we found almost double the amount of Ni remaining in the Fh after mild extraction compared to SRNOM-Fh. XRD showed that Fh transformed to goethite and magnetite whereas SRNOM-Fh did not transform despite 57Fe isotope tracer experiments confirmed that SRNOM-Fh underwent extensive atom exchange with aqueous Fe(II). Our findings suggest that Fe atom exchange may not be sufficient for obvious Ni stabilization and that transformation to secondary minerals may be necessary for Ni stabilization to occur.
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•Ni is released and re-sorbed during Fe(II)-catalyzed ferrihydrite (Fh) transformation.•Ni stability increases when Fh transforms into secondary Fe minerals.•Natural organic matter (NOM) inhibits Fh transformation and Ni stabilization.•Only Fe atom exchange between Fe(II) and Fh cannot obviously increase Ni stability.
Details
- Title: Subtitle
- Natural organic matter inhibits Ni stabilization during Fe(II)-catalyzed ferrihydrite transformation
- Creators
- Zhe Zhou - University of IowaDrew E Latta - University of IowaMichelle M Scherer - University of Iowa
- Resource Type
- Journal article
- Publication Details
- The Science of the total environment, Vol.755(Pt 2), pp.142612-142612
- Publisher
- Elsevier B.V
- DOI
- 10.1016/j.scitotenv.2020.142612
- PMID
- 33045610
- ISSN
- 0048-9697
- eISSN
- 1879-1026
- Grant note
- DOI: 10.13039/501100004543, name: China Scholarship Council; DOI: 10.13039/100000001, name: National Science Foundation
- Language
- English
- Date published
- 02/10/2021
- Academic Unit
- Civil and Environmental Engineering; IIHR--Hydroscience and Engineering
- Record Identifier
- 9984197316702771
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