Selected Fe and Mn (nano)oxides as perspective amendments for the stabilization of As in contaminated soils
Jazyk angličtina Země Německo Médium print-electronic
Typ dokumentu časopisecké články
PubMed
26895725
DOI
10.1007/s11356-016-6200-9
PII: 10.1007/s11356-016-6200-9
Knihovny.cz E-zdroje
- Klíčová slova
- Adsorption, Arsenic, Immobilization, Mn oxide, Nanomaghemite, Nanomagnetite,
- MeSH
- adsorpce MeSH
- arsen analýza chemie MeSH
- kinetika MeSH
- koncentrace vodíkových iontů MeSH
- látky znečišťující půdu analýza chemie MeSH
- nanočástice chemie MeSH
- oxidy chemie MeSH
- půda chemie MeSH
- regenerace a remediace životního prostředí MeSH
- sloučeniny manganu chemie MeSH
- železité sloučeniny chemie MeSH
- znečištění životního prostředí analýza MeSH
- Publikační typ
- časopisecké články MeSH
- Názvy látek
- arsen MeSH
- ferric oxide MeSH Prohlížeč
- látky znečišťující půdu MeSH
- manganese oxide MeSH Prohlížeč
- oxidy MeSH
- půda MeSH
- sloučeniny manganu MeSH
- železité sloučeniny MeSH
An amorphous Mn oxide (AMO), nanomaghemite, and nanomagnetite were used as potential amendments reducing the mobility of As in three contrasting contaminated soils differing in origin of As contamination. Adsorption experiments and XPS analyses combined with incubation batch experiments and pH-static leaching tests were used. The AMO showed excellent adsorption capacity for As(V) reaching a maximum of 1.79 mmol g(-1) at pH 7 and 8. Interestingly, the adsorption capacity in this case decreases with decreasing pH, probably as a result of AMO dissolution at lower pH values. Chemical sorption of As(V) onto AMO was further confirmed with XPS. Both Fe nano-oxides proved the highest adsorption capacity at pH 4 reaching 11 mg g(-1) of adsorbed As(V). The AMO was also the most efficient amendment for decreasing As concentrations in soil solutions during 8 weeks of incubation. Additionally, pH-static leaching tests were performed at pH 4, 5, 6, 7, and natural pH (not adjusted) and AMO again proved the highest ability to decrease As content in leachate. On the other hand, strong dissolution of this amendment at lower pH values (especially pH 4) was observed. For that reason, AMO appears as a promising stabilizing agent for As, especially in neutral, alkaline, or slightly acidic soils, where As(V) species are expected to be more mobile.
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