Podrobnosti záznamu

Název
    Assessment of the BCR sequential extraction procedure for thallium fractionation using synthetic mineral mixtures
Autor
    Chrastný, Vladislav
    Drahota, Petr
    Grygar, Tomáš
    Komárek, Michael
    Tejnecký, Václav
    Vaněk, Aleš
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Journal of Hazardous Materials
Svazek/č.
    Roč. 176, č. 1-3
Strany
    6
Rok
    2010
Výraz tezauru
    birnessite
    ferrihydrite
    goethite
    illite
    metal
    sequential extraction
Klíčové slovo
    Assessment
    BCR
    Extraction
    Fractionation
    Mineral
    Mixtures
    Procedure
    Sequential
    Synthetic
    Thallium
    Using
Abstrakt (anglicky)
   This work focused on the specific behavior of Tl-bearing phases in the BCR sequential extraction (SE) scheme, namely Tl-bearing ferrihydrite, goethite, birnessite, calcite, illite, sphalerite and feldspar in their simple model mixtures with quartz. The amount of Tl released as the exchangeable/acid-extractable fraction (55-82% of the total Tl content) showed a substantial H+-promoted dissolution of all Fe(III) and Mn(III,IV) oxides (corresponding to up to 61% of solid Fe dissolved) and incongruent extraction of Tl from ferrihydrite and goethite. Reductive conditions of the second SE step were insufficient to complete goethite dissolution. Similarly, insufficient oxidation of sphalerite and lower Tl recovery of the oxidisable fraction was identified. In contrast, the BCR SE seems to produce well predictable results of Tl leaching from Tl-bearing calcite and feldspar. Only 70% of total Tl content was extracted from Tl-modified illite, i.e., Tl was strongly fixed to the illite matrix.
Přispěvatel
    UK Praha, Přírodovědecká fakulta
Kód přispěvatele
    UK, PřF
Zdrojový formát
    R
Datum importu
    8. 8. 2012