Podrobnosti záznamu

Název
    Chemical response of a small stream in a forested catchment (central Czech Republic) to a short-term in-stream acidification
Autor
    Hruška, Jakub
    Maggini, L.
    Navrátil, Tomáš
    Norton, S. A.
    Skřivan, Petr
    Vach, Marek
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Hydrology and Earth System Sciences
Svazek/č.
    Roč. 7, č. 3
Strany
    13
Rok
    2003
Výraz tezauru
    Al, Ca, Mg, base cations, acid-neutralization, stream acidification, recovery, stream sediment, experiment, modeling, adsorption, desorption
Klíčové slovo
    Acidification
    Catchment
    Central
    Chemical
    Czech
    Forested
    In-stream
    Republic
    Response
    Short-term
    Small
    Stream
Abstrakt (anglicky)
   Lesni potok was artificially acidified with HCl for 4 hours to assess the role of stream substrate in acid-neutralization and recovery. The pH was lowered from 4.7 to 3.2. Desorption of Ca and Mg, and desorption or solution of Al dominated acid-neutralization; Al mobilization dominated later. The stream substrate released 4,542 meq Ca, 1,184 meq Mg, and 2,329 meq Al over a 45 m long and 1 m wide stream segment. Smaller amounts of Be, Cd, Fe, and Mn were released. Adsorption of SO42- and desorption of F- occurred during the acidification phase of the experiment. The exchange reactions were rapidly reversible for Ca, Mg, and SO42- but not symmetric as the substrate resorbed 1,083, 790 and 0 meq Ca, Mg, and Al, respectively, in a 4-hour recovery period. Desorption of SO42- occurred during the resorption of Ca and Mg. These exchange and dissolution reactions delay acidification, diminish the pH depression, and retard recovery from episodic acidification.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014