title: Interactions of nano-oxides with low-molecular-weight organic acids in a contaminated soil.
abstract: Various low-molecular-weight organic acids (LMWOAs) play an important role in the mobilisation of contaminants and their subsequent uptake by plants. Nano-maghemite (NM) and an amorphous Mn oxide (AMO) were investigated for their stabilisation potential under simulated rhizosphere conditions in terms of their use during chemical stabilisation and aided phytostabilisation of metal(loid)s in contaminated soils. In order to understand the reactivity of these potential sorbents of contaminants in soils and subsequent mobility of metal(loid)s, a set of time-dependent batch leaching experiments was performed using a mix of acetic, lactic, citric, malic and formic acids simulating root exudates. Despite being relatively unstable under given conditions, the AMO proved to be an efficient amendment for rapid stabilisation of both metals and As compared to NM. Generally, low pH (∼ 4) and the presence of citrate complexes resulted in higher mobility of metals in the non- and NM-amended soil. In contrast, the presence of AMO in the soil accelerated the neutralisation reactions related to pH increase and (co-) precipitation of secondary Fe/Mn/Al oxyhydroxides. Mineralogical transformations of the AMO showed to be crucial for contaminant immobilisation.
authors: Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 16521 Prague 6 - Suchdol, Czech Republic. Electronic address: vitkovam@fzp.czu.cz.
authors: Martina
authors: M
authors: Vítková
authors: Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 16521 Prague 6 - Suchdol, Czech Republic.
authors: Michael
authors: M
authors: Komárek
authors: Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 16521 Prague 6 - Suchdol, Czech Republic.
authors: Václav
authors: V
authors: Tejnecký
authors: Department of Environmental Geosciences, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 16521 Prague 6 - Suchdol, Czech Republic.
authors: Hana
authors: H
authors: Šillerová
mesh_terms: D001151:Arsenic / Q000737:chemistry; D002264:Carboxylic Acids / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008670:Metals / Q000737:chemistry; D008970:Molecular Weight; D010087:Oxides / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D002264:Carboxylic Acids; D005290:Ferric Compounds; D017895:Manganese Compounds; D008670:Metals; D010087:Oxides; D012989:Soil Pollutants; C000499:ferric oxide; C027424:manganese oxide; D001151:Arsenic
keywords: Contaminated soil; Metals; Nano-oxides; Organic acids