Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1021/acs.est.2c04915 |
| Document | accepted manuscript |
| Title (Primary) | Environmental risk of arsenic mobilization from disposed sand filter materials |
| Author | Le, A.V.; Muehe, E.M.; Drabesch, S.; Pacheco, J.L.; Bayer, T.; Joshi, P.; Kappler, A.; Mansor, M. |
| Source Titel | Environmental Science & Technology |
| Year | 2022 |
| Department | UMB |
| Volume | 56 |
| Issue | 23 |
| Page From | 16822 |
| Page To | 16830 |
| Language | englisch |
| Topic | T7 Bioeconomy |
| Supplements | Supplement 1 |
| Keywords | arsenic-bearing water treatment residuals; open disposal; disposed filter-sand; microbial reduction; colloidal transport; arsenic remobilization |
| Abstract | Arsenic (As)-bearing water treatment residuals (WTRs) from household sand filters are usually disposed on top of floodplain soils and may act as a secondary As contamination source. We hypothesized that open disposal of these filter-sands to soils will facilitate As release under reducing conditions. To quantify the mobilization risk of As, we incubated the filter-sand, the soil, and a mixture of the filter-sand and soil in anoxic artificial rainwater and followed the dynamics of reactive Fe and As in aqueous, solid, and colloidal phases. Microbially mediated Fe(III)/As(V) reduction led to the mobilization of 0.1–4% of the total As into solution with the highest As released from the mixture microcosms equaling 210 μg/L. Due to the filter-sand and soil interaction, Mössbauer and X-ray absorption spectroscopies indicated that up to 10% Fe(III) and 32% As(V) were reduced in the mixture microcosm. Additionally, the mass concentrations of colloidal Fe and As analyzed by single-particle ICP-MS decreased by 77–100% compared to the onset of reducing conditions with the highest decrease observed in the mixture setups (>95%). Overall, our study suggests that (i) soil provides bioavailable components (e.g., organic matter) that promote As mobilization via microbial reduction of As-bearing Fe(III) (oxyhydr)oxides and (ii) As mobilization as colloids is important especially right after the onset of reducing conditions but its importance decreases over time. |
| Le, A.V., Muehe, E.M., Drabesch, S., Pacheco, J.L., Bayer, T., Joshi, P., Kappler, A., Mansor, M. (2022): Environmental risk of arsenic mobilization from disposed sand filter materials Environ. Sci. Technol. 56 (23), 16822 - 16830 10.1021/acs.est.2c04915 |
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