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  Arsenic removal from natural groundwater using ‘green rust’: Solid phase stability and contaminant fate

Perez, J., Schiefler, A. A., Navaz Rubio, S., Reischer, M., Overheu, N. D., Benning, L. G., Tobler, D. J. (2021): Arsenic removal from natural groundwater using ‘green rust’: Solid phase stability and contaminant fate. - Journal of Hazardous Materials, 401, 123327.
https://doi.org/10.1016/j.jhazmat.2020.123327

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002740 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002740_3
Genre: Journal Article

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 Creators:
Perez, J.P.H.1, Author              
Schiefler, Adrian Alexander2, Author
Navaz Rubio, Sandra1, Author              
Reischer, Markus2, Author
Overheu, Niels Døssing2, Author
Benning, Liane G.1, Author              
Tobler, Dominique J.2, Author
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13.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_754888              
2External Organizations, ou_persistent22              

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 Abstract: Arsenic (As) contamination in groundwater remains a pressing global challenge. In this study, we evaluated the potential of green rust (GR), a redox-active iron phase frequently occurring in anoxic environments, to treat As contamination at a former wood preservation site. We performed long-term batch experiments by exposing synthetic GR sulfate (GRSO4) to As-free and As-spiked (6 mg L−1) natural groundwater at both 25 and 4 °C. At 25 °C, GRSO4 was metastable in As-free groundwater and transformed to GRCO3, and then fully to magnetite within 120 days; however, GRSO4 stability increased 7-fold by lowering the temperature to 4 °C, and 8-fold by adding As to the groundwater at 25 °C. Highest GRSO4 stability was observed when As was added to the groundwater at 4 °C. This stabilizing effect is explained by GR solubility being lowered by adsorbed As and/or lower temperatures, inhibiting partial GR dissolution required for transformation to GRCO3, and ultimately to magnetite. Despite these mineral transformations, all added As was removed from As-spiked samples within 120 days at 25 °C, while uptake was 2 times slower at 4 °C. Overall, we have successfully documented that GR is an important mineral substrate for As immobilization in anoxic subsurface environments.

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 Dates: 2021
 Publication Status: Finally published
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 Identifiers: DOI: 10.1016/j.jhazmat.2020.123327
GFZPOF: p3 PT3 Earth Surface and Climate Interactions
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Title: Journal of Hazardous Materials
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 401 Sequence Number: 123327 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals272