Record details

    Organic Solutes and the Recovery of a Bog Stream from Chronic Acidification
Statement of responsibility
    Jakub Hruška, Chris E. Johnson, Pavel Krám, Chin-yi Liao
    Hruška, Jakub
    Johnson, Chris E.
    Krám, Pavel, 1960-
    Liao, Chin-yi
Source title - serial
    Environmental science and technology
    Vol. 31
    p. 3677-3681
    5 obr., 1 tab.
    Obsahuje bibliografické odkazy
    Zkr. název ser.: Environm. Sci. Technol.
Subject group
    kyselina organická
    kyselý déšť
    oxid siřičitý
    studie experimentální
    uhlík organický
    voda povrchová
Geographical name
    Lysina (Cheb)
Abstract (in english)
   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
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    6. 3. 2008
Import date
    8. 8. 2012