Concentrations and Distributions of Metals Associated with Dissolved Organic Matter from the Suwannee River (GA, USA)

Keshia M. Kuhn, Elisabeth Neubauer, Thilo Hofmann, Frank von der Kammer, George R. Aiken, Patricia A. Maurice (Korresp. Autor*in)

    Veröffentlichungen: Beitrag in FachzeitschriftArtikelPeer Reviewed

    Abstract

    Concentrations and distributions of metals in Suwannee River (SR) raw filtered surface water (RFSW) and dissolved organic matter (DOM) processed by reverse osmosis (RO), XAD-8 resin (for humic and fulvic acids [FA]), and XAD-4 resin (for "transphilic" acids) were analyzed by asymmetrical flow field-flow fractionation (AsFlFFF). SR samples were compared with DOM samples from Nelson's Creek (NLC), a wetland-draining stream in northern Michigan; previous International Humic Substances Society (IHSS) FA and RO samples from the SR; and an XAD-8 sample from Lake Fryxell (LF), Antarctica. Despite application of cation exchange during sample processing, all XAD and RO samples contained substantial metal concentrations. AsFlFFF fractograms allowed metal distributions to be characterized as a function of DOM component molecular weight (MW). In SR RFSW, Fe, Al, and Cu were primarily associated with intermediate to higher than average MW DOM components. SR RO, XAD-8, and XAD-4 samples from May 2012 showed similar MW trends for Fe and Al but Cu tended to associate more with lower MW DOM. LF DOM had abundant Cu and Zn, perhaps due to amine groups that should be present due to its primarily algal origins. None of the fractograms showed obvious evidence for mineral nanoparticles, although some very small mineral nanoparticles might have been present at trace concentrations. This research suggests that AsFlFFF is important for understanding how metals are distributed in different DOM samples (including IHSS samples), which may be key to metal reactivity and bioavailability.
    OriginalspracheEnglisch
    Seiten (von - bis)54-65
    Seitenumfang12
    FachzeitschriftEnvironmental Engineering Science
    Jahrgang32
    Ausgabenummer1
    DOIs
    PublikationsstatusVeröffentlicht - 1 Jan. 2015

    ÖFOS 2012

    • 105302 Hydrochemie
    • 105303 Hydrogeologie
    • 104002 Analytische Chemie
    • 105904 Umweltforschung

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