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Journal Article

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

Authors
/persons/resource/jpperez

Perez,  J.P.H.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Schiefler,  Adrian Alexander
External Organizations;

/persons/resource/snavaz

Navaz Rubio,  Sandra
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Reischer,  Markus
External Organizations;

Overheu,  Niels Døssing
External Organizations;

/persons/resource/benning

Benning,  Liane G.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Tobler,  Dominique J.
External Organizations;

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5002740.pdf
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Citation

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


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5002740
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.