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Dissolved organic carbon reduces uranium bioavailability and toxicity. 2. Uranium[VI] speciation and toxicity to three tropical freshwater organisms.
Environ Sci Technol. 2011 Apr 01; 45(7):3082-9.ES

Abstract

The influence of dissolved organic carbon (DOC) on the toxicity of uranium (U) to three Australian tropical freshwater species, the Northern Trout Gudgeon (Mogurnda mogurnda), green hydra (Hydra viridissima) and unicellular green alga (Chlorella sp.) was assessed. Exposures were conducted in synthetic soft water without DOC and with DOC added in the form of standard Suwannee River Fulvic Acid (SRFA). Organisms were exposed to a range of U concentrations at a range of DOC concentrations (0-20 mg L(-1)). U toxicity was up to 20 times less in water containing 20 mg L(-1) DOC, relative to DOC-free test waters. U toxicity was also assessed using natural water from a tropical Australian billabong containing 10 mg L(-1) DOC. U toxicity was up to ten times less in the billabong water, relative to DOC--free test waters. SRFA was twice as effective at reducing U toxicity as the billabong water at equivalent DOC concentrations. Geochemical speciation modeling confirmed the decreased U toxicity that resulted from both DOC sources was primarily due to a decrease in the free uranyl ion (UO2(2+)) through complexation with DOC. A predictive model is presented for each of the organisms that can be used to predict U toxicity at a given U and DOC concentration.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Trenfield MA
Environmental Research Institute of the Supervising Scientist, Department of Sustainability, Environment, Water, Population and Communities, GPO Box 461, Darwin, Northern Territory, Australia 0801. Melanie.Trenfield@environment.gov.au
Ng JC
No affiliation info available
Noller BN
No affiliation info available
Markich SJ
No affiliation info available
Dam RA
No affiliation info available

MeSH

AnimalsAquatic OrganismsCarbonChlorellaFresh WaterHydraHydrogen-Ion ConcentrationKineticsModels, ChemicalPerciformesTropical ClimateUraniumWater Pollutants, Radioactive

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21351800

Citation

Trenfield, Melanie A., et al. "Dissolved Organic Carbon Reduces Uranium Bioavailability and Toxicity. 2. Uranium[VI] Speciation and Toxicity to Three Tropical Freshwater Organisms." Environmental Science & Technology, vol. 45, no. 7, 2011, pp. 3082-9.
Trenfield MA, Ng JC, Noller BN, et al. Dissolved organic carbon reduces uranium bioavailability and toxicity. 2. Uranium[VI] speciation and toxicity to three tropical freshwater organisms. Environ Sci Technol. 2011;45(7):3082-9.
Trenfield, M. A., Ng, J. C., Noller, B. N., Markich, S. J., & Dam, R. A. (2011). Dissolved organic carbon reduces uranium bioavailability and toxicity. 2. Uranium[VI] speciation and toxicity to three tropical freshwater organisms. Environmental Science & Technology, 45(7), 3082-9. https://doi.org/10.1021/es103349a
Trenfield MA, et al. Dissolved Organic Carbon Reduces Uranium Bioavailability and Toxicity. 2. Uranium[VI] Speciation and Toxicity to Three Tropical Freshwater Organisms. Environ Sci Technol. 2011 Apr 1;45(7):3082-9. PubMed PMID: 21351800.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dissolved organic carbon reduces uranium bioavailability and toxicity. 2. Uranium[VI] speciation and toxicity to three tropical freshwater organisms. AU - Trenfield,Melanie A, AU - Ng,Jack C, AU - Noller,Barry N, AU - Markich,Scott J, AU - Dam,Rick A van, Y1 - 2011/02/25/ PY - 2011/3/1/entrez PY - 2011/3/1/pubmed PY - 2011/6/15/medline SP - 3082 EP - 9 JF - Environmental science & technology JO - Environ Sci Technol VL - 45 IS - 7 N2 - The influence of dissolved organic carbon (DOC) on the toxicity of uranium (U) to three Australian tropical freshwater species, the Northern Trout Gudgeon (Mogurnda mogurnda), green hydra (Hydra viridissima) and unicellular green alga (Chlorella sp.) was assessed. Exposures were conducted in synthetic soft water without DOC and with DOC added in the form of standard Suwannee River Fulvic Acid (SRFA). Organisms were exposed to a range of U concentrations at a range of DOC concentrations (0-20 mg L(-1)). U toxicity was up to 20 times less in water containing 20 mg L(-1) DOC, relative to DOC-free test waters. U toxicity was also assessed using natural water from a tropical Australian billabong containing 10 mg L(-1) DOC. U toxicity was up to ten times less in the billabong water, relative to DOC--free test waters. SRFA was twice as effective at reducing U toxicity as the billabong water at equivalent DOC concentrations. Geochemical speciation modeling confirmed the decreased U toxicity that resulted from both DOC sources was primarily due to a decrease in the free uranyl ion (UO2(2+)) through complexation with DOC. A predictive model is presented for each of the organisms that can be used to predict U toxicity at a given U and DOC concentration. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/21351800/Dissolved_organic_carbon_reduces_uranium_bioavailability_and_toxicity__2__Uranium[VI]_speciation_and_toxicity_to_three_tropical_freshwater_organisms_ L2 - https://doi.org/10.1021/es103349a DB - PRIME DP - Unbound Medicine ER -