Formation of Binary and Ternary Colloids and Dissolved Complexes of Organic Matter, Fe and As
Abstract
Natural organic matter can change As speciation via redox reactions and complexation influencing its mobility and toxicity. Here we show that binary and ternary colloids and dissolved complexes of As(V), Fe and organic matter (OM) form at environmentally relevant conditions and analyzed these colloids/complexes using ATR-FTIR- and Mossbauer-spectroscopy. Dissolved Fe-OM complexes and ferrihydrite-OM colloids were formed by reacting OM with ferrihydrite (Fe(OH)(3)). Mossbauer-spectroscopy showed that 95% of the Fe in the Fe-OM fraction were present as ferrihydrite-OM colloids while the remaining 5% were in the dissolved fraction. In As(V) plus Fe-OM systems (containing both dissolved and colloidal Fe-OM), 3.5-8 microg As(V)/mg OC was bound to the Fe-OM complexes/colloids compared to <0.015 microg As(V)/mg OC in As-OM systems (without Fe). Upon filtration of As-Fe-OM complexes/colloids with a 3 kDa filter, approximately 6% As was found in the dissolved fraction and approximately 94% As in colloidal Fe-OM. This suggests that As(V) is associated with Fe-OM mainly via ferrihydrite-OM colloids but to a small extent also in dissolved Fe-OM complexes via Fe-bridging. Since As-contaminated soils and aquifers contain Fe(III) minerals and OM, colloids of As with OM-loaded ferrihydrite and complexes of As with dissolved Fe-OM have to be considered when studying As transport.
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According to Sharma et al. and Mitsunobu et al., a similar mechanism with much greater affinity to organic matter could be expected with Sb.
“According to Sharma et al. [16, 17] and Mitsunobu et al. [18], a similar mechanism with much greater affinity to organic matter could be expected with Sb [19].”
From Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments (2016) · cites this paper as [16]
Cites
Mössbauer Spectroscopy of Environmental Materials and Their Industrial Utilization
Murad, E., & Cashion, J. (2004) · doi:10.1007/978-1-4419-9040-2 · Cited by 348 · see citing works
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Chemical Processes Affecting the Mobility of Heavy Metals and Metalloids in Soil Environments
Caporale, A. G., & Violante, A. (2016) · Current Pollution Reports · doi:10.1007/s40726-015-0024-y · Cited by 369 · see citing works
Biogenic Fe(III) minerals: from formation to diagenesis and preservation in the rock record
Posth, N. R., Canfield, D. E., & Kappler, A. (2014) · Earth-Science Reviews · doi:10.1016/j.earscirev.2014.03.012 · Cited by 153 · see citing works
Glodowska, M., Stopelli, E., Schneider, M., Lightfoot, A., Rathi, B., Straub, D., Patzner, M., Duyen, V. T., AdvectAs Team Members, Berg, M., et al. (2020) · Environmental Science & Technology · doi:10.1021/acs.est.9b07183 · Cited by 91 · see citing works
Self-citation
- Authors
- Sharma, P., Ofner, J., & Kappler, A.
- Affiliations
- University of Bayreuth (DE)
- Corresponding author
- Kappler, Andreas
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2010-04-30
- Volume
- 44
- Issue
- 12
- Pages
- 4479-4485
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1986239215
- Cited by
- 281
- References
- 1
- Citations by year
- 2026: 12 · 2025: 10 · 2024: 25 · 2023: 21 · 2022: 32 · 2021: 21 · 2020: 20 · 2019: 22 · 2018: 22 · 2017: 16 · 2016: 16 · 2015: 15 · 2014: 19 · 2013: 10 · 2012: 9
- FWCI
- 8.08
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Environmental Science & Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Deutsche Forschungsgemeinschaft
- Bundesministerium für Bildung und Forschung
- Topics
- Physical Sciences › Environmental Science › Environmental Chemistry › Arsenic contamination and mitigation
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Coal and Its By-products
- Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
- Keywords
- arsenic speciation, arsenate, natural organic matter, ferrihydrite, colloids, ternary complex, redox reactions, arsenic mobility, arsenic transport, dissolved arsenic
- MeSH terms
- Adsorption, Arsenic, Colloids, Environment, Humic Substances, Iron, Minerals, Organic Chemicals, Solubility, Spectroscopy, Fourier Transform Infrared
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