Arsenate and Chromate Retention Mechanisms on Goethite. 1. Surface Structure
Abstract
The molecular structure of ions retained on mineral surfaces is needed to accurately model their sorption process and to determine their stability. Extended X-ray absorption fine structure (EXAFS) spectroscopy was used in this study to deduce the local coordination environment of two environmental contaminants, arsenate and chromate, on the mineral goethite (α-FeOOH). Based on the oxyanion−Fe distances, it was concluded that three different surface complexes exist on goethite for both oxyanions: a monodentate complex, a bidentate-binuclear complex, and a bidentate-mononuclear complex. At low surface coverages, the monodentate complex was favored while at higher coverages the bidentate complexes were more prevalent the bidentate-binuclear complex appears to be in the greatest proportion at these highest surface coverages. Therefore, modeling efforts for chromate or arsenate retention on goethite need to consider a monodentate complex at very low coverages, both the monodentate and bidentate complexes at intermediate coverages, and predominantly the bidentate complexes at very high coverages.
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Arsenate may form different surface complexes on inorganic soil components: monodentate, bidentate-mononuclear and bidentate-binuclear complexes in different proportion depending on pH and surface coverage.
“Particularly, arsenate may form different surface complexes on inorganic soil components: monodentate, bidentate-mononuclear and bidentatebinuclear complexes in different proportion depending on pH and surface coverage (Fendorf et al. 1997; O'Reilly et al . 2001).”
From MOBILITY AND BIOAVAILABILITY OF HEAVY METALS AND METALLOIDS IN SOIL ENVIRONMENTS (2010) · cites this paper as Fendorf et al. 1997
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- Authors
- Fendorf, S., Eick, M. J., Grossl, P., & Sparks, D. L.
- Affiliations
- Utah State University (US)
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 1997-01-30
- Volume
- 31
- Issue
- 2
- Pages
- 315-320
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W2015145621
- Cited by
- 1,017
- References
- 0
- Citations by year
- 2026: 14 · 2025: 22 · 2024: 16 · 2023: 33 · 2022: 20 · 2021: 32 · 2020: 42 · 2019: 42 · 2018: 26 · 2017: 42 · 2016: 53 · 2015: 37 · 2014: 37 · 2013: 58 · 2012: 43
- FWCI
- 16.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Physics and Astronomy › Radiation › X-ray Spectroscopy and Fluorescence Analysis
- Keywords
- arsenate, chromate, goethite, surface complexation, local coordination environment, bidentate complexes, surface coverage, EXAFS spectroscopy
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