Dissolved organic carbon reduces uranium bioavailability and toxicity. 1. Characterization of an aquatic fulvicacid and its complexation with uranium[VI]

Trenfield, Melanie A., McDonald, Suzanne, Kovacs, Krisztina, Lesher, Emily K., Pringle, Jennifer M., Markich, Scott J., Ng, Jack C., Noller, Barry, Brown, Paul L. and van Dam, Rick A. (2011) Dissolved organic carbon reduces uranium bioavailability and toxicity. 1. Characterization of an aquatic fulvicacid and its complexation with uranium[VI]. Environmental Science & Technology, 45 7: 3075-3081. doi:10.1021/es103330w


Author Trenfield, Melanie A.
McDonald, Suzanne
Kovacs, Krisztina
Lesher, Emily K.
Pringle, Jennifer M.
Markich, Scott J.
Ng, Jack C.
Noller, Barry
Brown, Paul L.
van Dam, Rick A.
Title Dissolved organic carbon reduces uranium bioavailability and toxicity. 1. Characterization of an aquatic fulvicacid and its complexation with uranium[VI]
Journal name Environmental Science & Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2011
Sub-type Article (original research)
DOI 10.1021/es103330w
Volume 45
Issue 7
Start page 3075
End page 3081
Total pages 7
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2012
Language eng
Formatted abstract
Fulvic acid (FA) from a tropical Australian billabong (lagoon) was isolated with XAD-8 resin and characterized using size exclusion chromatography, solid state cross-polarization magic angle spinning, 13C nuclear magnetic resonance spectroscopy, elemental analysis, and potentiometric acid-base titration. Physicochemical characteristics of the billabong FA were comparable with those of the Suwannee River Fulvic Acid (SRFA) standard. The greater negative charge density of the billabong FA suggested it contained protons that were more weakly bound than those of SRFA, with the potential for billabong water to complex less metal contaminants, such as uranium (U). This may subsequently influence the toxicity of metal contaminants to resident freshwater organisms. The complexation of U with dissolved organic carbon (DOC) (10 mg L-1) in billabong water was calculated using the  HARPHRQgeochemical speciation model and also measured using flow field-flow fractionation combined with inductively coupled plasma mass-spectroscopy. Agreement between both methods was very good (within 4% as U-DOC). The results suggest that in billabong water at pH 6.0, containing an average DOC of 10 mg L-1 and a U concentration of 90 μg L-1, around 10% of U is complexed with DOC.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 24 Mar 2011, 15:51:00 EST by Manjit Sanghera on behalf of National Res Centre For Environmental Toxicology