Abstract
Bentonite was applied in diffusive studies for selenium, an emerging contaminant. The planar source method was used to determine the apparent and effective diffusion coefficients and assess the mobility of the selenium species. A double Gaussian function described the results. Different diffusion coefficients were associated with different mobilities, and consequently, to the coexistence of two selenium species: selenite and selenate. Apparent diffusion coefficients were higher for selenate, around 10− 10 m2 s− 1, than for selenite, around 10− 12 m2 s− 1. Results from sequential extraction and distribution coefficient justified selenate’s greater mobility than selenite. Since the increase in redox potential from 448 to 511 mV may be associated with selenite oxidation in an interconversion process, the diffusion in bentonite demonstrates that applications in geological barriers deserve attention regarding the mobilization of selenium species. Interconversions can mobilize selenium, as reduced species can shift to more oxidized and mobile species, enhancing environmental contamination.
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Notes
The main numerical results in this section can be generated from the MatLab script available at https://data.mendeley.com/datasets/d8mjk92n8g/1; Angelita Ribeiro, Barbara Kroetz, Cesar Tarley, Taufik Abrao, Paulo Parreira, and Maria Santos (2021), “Separating selenium species by diffusion in Brazilian bentonite: a mathematical modeling approach”, Mendeley Data, 16 December 2021/Version 1, https://doi.org/10.17632/d8mjk92n8g.1
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Acknowledgements
The authors would like to thank CNPq (The National Council for Scientific and Technological Development), under Grants 309927/2015-3 and 304066/2015-0 (Researcher grants), Capes (Coordination of Superior Level Staff Improvement) and Araucaria Foundation under Grants 507/2014 (Researcher grant) for their financial support and fellowships.
Funding
Grants 309927/2015-3 and Researcher grants 304066/2015-0 from CNPq, Capes (Coordination of Superior Level Staff Improvement) and Araucaria Foundation under Grants 507/2014 (Researcher grants) for their financial support and fellowships.
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The main numerical results in this section can be generated from the MatLab script available at https://data.mendeley.com/datasets/d8mjk92n8g/1; Angelita Ribeiro, Barbara Kroetz, Cesar Tarley, Taufik Abrao, Paulo Parreira, and Maria Santos (2021), “Separating selenium species by diffusion in Brazilian bentonite: a mathematical modeling approach”, Mendeley Data, 16 December 2021/Version 1, https://doi.org/10.17632/d8mjk92n8g.1
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Ribeiro, A., Kroetz, B.L., Tarley, C.R.T. et al. Separating selenium species by diffusion in Brazilian bentonite: a mathematical modeling approach. Environ Sci Pollut Res 29, 88119–88130 (2022). https://doi.org/10.1007/s11356-022-21529-8
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DOI: https://doi.org/10.1007/s11356-022-21529-8