Record details

Title
    Kinetics of the release of Silicon and Aluminium from Aluminosilicates into Aqueous Mildly Acid Solutions
Statement of responsibility
    Jiří Faimon
Author
    Faimon, Jiří, 1950-
Language
    anglicky
Source title - serial
    Scripta facultatis scientiarum naturalium Universitatis Masarykianae brunensis
Vol./nr.
    Vol. 25
Pages
    p. 59-68
Year
    1995
Notes
    4 obr., 5 tab., 2 s.bibl.
    Anglické resumé
    Zkr. název ser.: Scr. Univ. Masaryk. brun., Geol.
Subject group
    alumosilikáty
    amfibolit
    defekt povrchu krystalu
    granodiorit
    hliník
    kinematika
    křemík
    rozpustnost
    studie experimentální
    zvětrávání
    živce
Geographical name
    Brno-Řečkovice
    ČR-Morava
    Věžná (Žďár nad Sázavou)
    Želešice (Brno-venkov)
Keyword
    Acid
    Aluminium
    Aluminosilicates
    Aqueous
    Kinetics
    Mildly
    Release
    Silicon
    Solutions
Abstract (in english)
   The release of Si and Al from feldspar, granodiorite and amphibolite into mildly acid solutions was investigated during long-term laboratory batch experiments. A simple kinetic model, including dissolution of surface defects and precipitation of secondary solids, was proposed. The rate constans for fluxes of Si and Al in and out from solution were estimated on the basis of the model. They are summarized as follow: Si fluxes into solution ( mol.m-2 day-1): feldspar 1.35, granodiorite 2.18, amphibolite 5.57; Al fluxes into solution ( mol.m-2 day-1): feldspar 3.75, granodiorite 1.14, amphibolite 0.18; Ai fluxes out away from solution (day-1): feldspar 6.3x10-3, granodiorite 7.4x10-3, amphibolite 2.3x10-2; Al fluxes out away from solution (day-1): feldspar 4.3x10-2, granodiorite 1.2x10-1, amphibolite 1.6x10-1. The fluxes of silicon from the aluminosilicates increase in the sequence feldspar - granodiorite - amphibolite. The fluxes of aluminium seem to follow the opposite trend.
   The release of Si and Al from feldspar is non-stechiometric. The fluxes of Al from solution into secondary solids greatly exceed the fluxes of Si
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    18. 2. 2008
Import date
    8. 8. 2012