Toxicity of uranium to Daphnia magna

Poston, Ted M.; Hanf, Robert W.; Simmons, Mary Ann

doi:10.1007/bf00159350

Cited by 49 publications

(34 citation statements)

References 7 publications

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“…The next series of papers (Trapp, 1986;Hyne et al, 1992a,b;Bywater et al, 1991;Poston et al, 1984;Barata et al, 1999) all reported effect concentrations that graded from 0.15 to 0.9 mg U L ÿ1 , with no distinct groupings of effect concentrations. This is a typical and expected outcome for a summary of ecotoxicology results, because it reflects the fact that there is a continuum of effect concentrations over a series of the many possible organisms and endpoints.…”

Section: Relative To Water Concentrationsmentioning

confidence: 99%

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Derivation of ecotoxicity thresholds for uranium

Sheppard¹,

Sheppard²,

Gallerand

et al. 2005

Journal of Environmental Radioactivity

209

105

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Section: Relative To Water Concentrationsmentioning

confidence: 99%

“…Poston et al (1984) did a screening level test and at 96 h only saw mortality at 100 mg L ÿ1 , it was 16% mortality so this was recorded as an LC 16 . Water hardness was 70 mg L ÿ1 .…”

Section: Very Soft Watermentioning

confidence: 99%

Derivation of ecotoxicity thresholds for uranium

Sheppard¹,

Sheppard²,

Gallerand

et al. 2005

Journal of Environmental Radioactivity

209

105

View full text Add to dashboard Cite

“…Several other studies have determined the effects of increasing water hardness on the toxicity of U to freshwater organisms (fish [105]; water flea [106,107]). However, because these studies confounded the effects of increasing water hardness with increasing alkalinity and pH, the true effects of water hardness (i.e., Ca and/or Mg concentration) on U toxicity could not be discerned.…”

Section: Effect Of Water Hardnessmentioning

confidence: 99%

Uranium Speciation and Bioavailability in Aquatic Systems: An Overview

Markich

2002

The Scientific World JOURNAL

203

142

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The speciation of uranium (U) in relation to its bioavailability is reviewed for surface waters (fresh-and seawater) and their sediments. A summary of available analytical and modeling techniques for determining U speciation is also presented. U(VI) is the major form of U in oxic surface waters, while U(IV) is the major form in anoxic waters. The bioavailability of U (i.e., its ability to bind to or traverse the cell surface of an organism) is dependent on its speciation, or physicochemical form. U occurs in surface waters in a variety of physicochemical forms, including the free metal ion (U 4+ or UO 2 2+ ) and complexes with inorganic ligands (e.g., uranyl carbonate or uranyl phosphate), and humic substances (HS) (e.g., uranyl fulvate) in dissolved, colloidal, and/or particulate forms. Although the relationship between U speciation and bioavailability is complex, there is reasonable evidence to indicate that UO 2 2+ and UO 2 OH + are the major forms of U(VI) available to organisms, rather than U in strong complexes (e.g., uranyl fulvate) or adsorbed to colloidal and/or particulate matter. U(VI) complexes with inorganic ligands (e.g., carbonate or phosphate) and HS apparently reduce the bioavailability of U by reducing the activity of UO 2 2+ and UO 2 OH + . The majority of studies have used the results from thermodynamic speciation modeling to support these conclusions. Time-resolved laser-induced fluorescence spectroscopy is the only analytical technique able to directly determine specific U species, but is limited in use to freshwaters of low pH and ionic strength. Nearly all of the available information relating the speciation of U to its bioavailability has been derived using simple, chemically defined experimental freshwaters, rather than natural waters. No data are available for estuarine or seawater. Furthermore, there are no available data on the relationship between U speciation and bioavailability in sediments. An understanding of this relationship has been hindered due to the lack of direct quantitative U speciation techniques for particulate phases. More robust analytical techniques for determining the speciation of U in natural surface waters are needed before the relationship between U speciation and bioavailability can be clarified.

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“…j No AWQC available; value is lowest concentration reported as chemotoxic to aquatic biota (Poston et al 1984).…”

Section: Benchmark Valuesmentioning

confidence: 99%

Baseline risk assessment for groundwater operable units at the Chemical Plant Area and the Ordnance Works Area, Weldon Spring, Missouri

1999

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Toxicity of uranium to Daphnia magna

Cited by 49 publications

References 7 publications

Derivation of ecotoxicity thresholds for uranium

Derivation of ecotoxicity thresholds for uranium

Uranium Speciation and Bioavailability in Aquatic Systems: An Overview

Baseline risk assessment for groundwater operable units at the Chemical Plant Area and the Ordnance Works Area, Weldon Spring, Missouri

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