Podrobnosti záznamu

Název
    Aluminium release rates from acidified clay structures : comparative kinetic study
Údaj o odpovědnosti
    David Hradil, Jiří Hostomský, Jana Soukupová
Další názvy
    Mid-European Clay Conference '01, Stará Lesná, 9-14 September 2001, Slovak Republic (Variant.)
Autor
    Hostomský, Jiří, 1941-
    Hradil, David
    Soukupová, Jana
Jazyk
    anglicky
Zdrojový dokument - seriál
    Geologica carpathica
Svazek/č.
    Vol. 53, no. 2
Strany
    p. 117-121
Rok
    2002
Poznámky
    3 diagr., 2 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Geol. carpath.
Klasifikační znak
    549
    552
Skupina konspektu
    549
    552
Předmětová skupina
    acidifikace
    chemismus hornin
    halloysit
    hliník
    illit
    jíl
    kaolinit
    minerály jílové
Geografické jméno
    USA-Georgia
Klíčové slovo
    Acidified
    Aluminium
    Clay
    Comparative
    Kinetic
    Rates
    Release
    Structures
    Study
Abstrakt (anglicky)
   Dissolution rates of several clay materials (reference kaolinite samples, natural kaolinites of different origin, illitic clays, halloysite) in 0.5 and 5 M sulphuric and 1 M hydrochloric acids were determined by measuring the release rate of aluminium into solution. The X-ray powder diffraction and X-ray fluorescence methods have been employed for mineralogical and chemical analyses of clay samples, respectively. The surface area of the samples was determined by a N2 adsorption technique (BET). The dissolved Al concentration was determined by spectrophotometry. The dissolution rate of kaolinite in 0.5 M sulphuric acid at 25 °C is approximately three times higher than in hydrochloric acid of formally equivalent H+ concentration. The dissolution in 5 M sulphuric acid is eight times faster if the solid phase is periodically separated from the acid solution, washed by distilled water and dried.
   The aluminium release rate decreases with the increasing amounts of clay micas in kaolinitic clays and is affected by the concentration of Al in the mineral structure. Crystallinity, as a factor reflecting the quality of the crystal structure, influences significantly the aluminium release rates during dissolution by acids
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    28. 3. 2008
Datum importu
    8. 8. 2012