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| Titel: |
Decreasing arsenic bioaccessibility/bioavailability in soils with iron amendments |
| Auteur: |
Subacz, Jonathan L. Barnett, Mark O. Jardine, Philip M. Stewart, Melanie A. |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 42 (2007) nr. 9 pagina's 1317-1329 |
| Jaar: |
2007-01 |
| Inhoud: |
We investigated the use of various iron amendments (metallic Fe and soluble Fe(II)- and Fe(III)-halide salts) to reduce arsenic (As) bioaccessibility (as a surrogate for oral bioavailability) in contaminated soils. Soluble Fe(II)- and Fe(III)-salts were more effective than metallic Fe in reducing As bioaccessibility. Adding soluble Fe(III)-salts to soil reduces As bioaccessibility in two ways, by increasing the Fe(III) (hydr)oxide content and by lowering the soil pH. A detailed investigation into the effect of soil moisture when adding Fe(III) amendments indicated that the reaction can occur in situ if sufficient (≥ 30% moisture) is added. If the amendments are added to the soil without moisture, a reduction in bioaccessibility will occur in the extraction fluid itself (i.e., an experimental artifact not reflecting a true in situ reduction in bioaccessibility). Adding Fe (III)-salts to nine As-contaminated soils at a Fe:As molar ratio of 100:1 reduced the average bioaccessibility in the soils by approximately a factor of two. Greater reductions in As bioaccessibility can be achieved by increasing the Fe:As molar ratio. These results suggest decreasing As bioaccessibility and bioavailability in soil by adding Fe amendments may be an effective strategy to remediate As-contaminated soils. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 10 van 15 gevonden artikelen
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