Podrobnosti záznamu

Název
    Organic Solutes and the Recovery of a Bog Stream from Chronic Acidification
Údaj o odpovědnosti
    Jakub Hruška, Chris E. Johnson, Pavel Krám, Chin-yi Liao
Autor
    Hruška, Jakub
    Johnson, Chris E.
    Krám, Pavel, 1960-
    Liao, Chin-yi
Jazyk
    anglicky
Zdrojový dokument - seriál
    Environmental science and technology
Svazek/č.
    Vol. 31
Strany
    p. 3677-3681
Rok
    1997
Poznámky
    5 obr., 1 tab.
    il.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Environm. Sci. Technol.
Předmětová skupina
    acidifikace
    hydrochemie
    kyselina organická
    kyselý déšť
    mobilizace
    oxid siřičitý
    povodí
    pufr
    rašeliniště
    studie experimentální
    uhlík organický
    voda povrchová
Geografické jméno
    ČR-Čechy
    Lysina (Cheb)
    Sokolov
Klíčové slovo
    Acidification
    Bog
    Chronic
    Organic
    Recovery
    Solutes
    Stream
Abstrakt (anglicky)
   Natural organic acids are important in the acid-base chemistry of many natural waters. However, field studies suggest that the degree of acid neutralization provided by natural organic acids is small, even in organic-rich waters. We added sulfuric acid and sodium bicarbone separately to a bog stream in the Czech Republic to evaluate the role of organic acids in the acidification and subsequentl recovery of brown waters subjected to chronically high acid deposition. despite naturally high organic acid concentrations (dissolved organic [DOC] concentration, 48.9 mg [-1, total carboxyl group concentration (C), 344 equiv L -1; organic acid anion concentration (RCOO-), 176 equiv L -1), only 10% of the added acid and base were neutralized by the protonation or deprotonation of carboxylic functional groups. Approximately 80% of the acid and base additions remained unbuffered. Release of aluminium and basic cations to solution accounted for the remainder of the added acid and base.
   A Gaussian model of organic acid dissociation, fitted to our experimental results, explained the variations in RCOO- and the minimal buffering offered by organic solutes. Sulfate and hydrogen ion (H+) concentrations at the study site declined sharply (ca. 50%) in 1992-1996, but DOC, C, and RCOO- were unchanged. Our experimental and monitoring results suggest that organic acids are not likely to hinder significantly the recovery of brown water streams in the region from chronic anthropogenic acidification
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    6. 3. 2008
Datum importu
    8. 8. 2012