Concentrations and distributions of metals associated with dissolved organic matter from the Suwannee River (GA, USA)

Environmental Engineering Science
By: , and 

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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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Concentrations and distributions of metals associated with dissolved organic matter from the Suwannee River (GA, USA)
Series title Environmental Engineering Science
DOI 10.1089/ees.2014.0298
Volume 32
Issue 1
Year Published 2015
Language English
Publisher Mary Ann Liebert, Inc. Publishers
Contributing office(s) Toxic Substances Hydrology Program, National Research Program - Central Branch
Description 12 p.
First page 54
Last page 65
Country United States
State Georgia
Other Geospatial Suwannee River