Podrobnosti záznamu

    Is a universal model of organic acidity possible: Comparison of the acid/base properties of dissolved organic carbon in the boreal and temperate zones
    Bishop, K.
    Hruška, Jakub
    Kohler, S.
    Laudon, H.
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Environmental Science & Technology
    Roč. 37, č. 9
Výraz tezauru
    dissolved organic carbon,surface waters,ion-exchange techniques,titration,acidification,humic substances,chemistry,solutes,stream,recovery
Klíčové slovo
Abstrakt (anglicky)
   The acid/base properties of dissolved organic carbon (DOC) are an important feature of soil and surface waters. We used a combination of ion-exchange techniques, titration, and surface water chemistry data to evaluate DOC character from two substantially different areas - the relatively pristine boreal zone of Sweden and the heavily acidified temperate zone of the Czech Republic. We found a significantly higher site density (amount of carboxylic groups per milligram of DOC) for the Swedish sites (10.2 ueq/mg of DOC +/- 0.6) as compared to the Czech sites (8.8 ueq/mg of DOC +/- 0.5). This suggests a slightly higher buffering capacity for Swedish DOC. A triprotic model of a type commonly incorporated in biogeochemical models was used for estimating the DOC dissociation properties. Despite differences in site density values, both models predict very similar dissociation and thus pH buffering by DOC in the environmentally important pH range of 3.5-5.0.
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
Datum importu
    15. 10. 2014