title: Phase-dependent phytoavailability of thallium--a synthetic soil experiment.
abstract: The study deals with the environmental stability of Tl-modified phases (ferrihydrite, goethite, birnessite, calcite and illite) and phytoavailability of Tl in synthetically prepared soils used in a model vegetation experiment. The data presented here clearly demonstrate a strong relationship between the mineralogical position of Tl in the model soil and its uptake by the plant (Sinapis alba L.). The maximum rate of Tl uptake was observed for plants grown on soil containing Tl-modified illite. In contrast, soil enriched in Ksat-birnessite had the lowest potential for Tl release and phytoaccumulation. Root-induced dissolution of synthetic calcite and ferrihydrite in the rhizosphere followed by Tl mobilization was detected. Highly crystalline goethite was more stable in the rhizosphere, compared to ferrihydrite, leading to reduced biological uptake of Tl. Based on the results obtained, the mineralogical aspect must be taken into account prior to general environmental recommendations in areas affected by Tl.
authors: Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Praha 6, Czech Republic. vaneka@af.czu.cz
authors: Aleš
authors: A
authors: Vaněk
authors: Martin
authors: M
authors: Mihaljevič
authors: Ivana
authors: I
authors: Galušková
authors: Vladislav
authors: V
authors: Chrastný
authors: Michael
authors: M
authors: Komárek
authors: Vít
authors: V
authors: Penížek
authors: Tereza
authors: T
authors: Zádorová
authors: Ondřej
authors: O
authors: Drábek
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry; D005290:Ferric Compounds / Q000737:chemistry; D008903:Minerals / Q000737:chemistry; D018517:Plant Roots / Q000187:drug effects / Q000378:metabolism; D058441:Rhizosphere; D031226:Sinapis / Q000187:drug effects / Q000378:metabolism*; D012987:Soil; D012989:Soil Pollutants / Q000737:chemistry*; D013793:Thallium / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D008903:Minerals; D012987:Soil; D012989:Soil Pollutants; C099089:illite; C092844:ferric oxyhydroxide; D013793:Thallium; D002119:Calcium Carbonate