Podrobnosti záznamu

Název
    Is a universal model of organic acidity possible: Comparison of the acid/base properties of dissolved organic carbon in the boreal and temperate zones
Autor
    Bishop, K.
    Hruška, Jakub
    Kohler, S.
    Laudon, H.
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Environmental Science & Technology
Svazek/č.
    Roč. 37, č. 9
Strany
    4
Rok
    2003
Výraz tezauru
    dissolved organic carbon,surface waters,ion-exchange techniques,titration,acidification,humic substances,chemistry,solutes,stream,recovery
Klíčové slovo
    Acid/base
    Acidity
    Boreal
    Carbon
    Comparison
    Dissolved
    Model
    Organic
    Possible
    Properties
    Temperate
    Universal
    Zones
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.
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (RIV)
Zdrojový formát
    R
Datum importu
    15. 10. 2014