Uranium determination in sea water

Rona, Elizabeth; Gilpatrick, L.O.; Jeffrey, Lela M.

doi:10.1029/tr037i006p00697

Cited by 59 publications

(7 citation statements)

References 10 publications

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“…In oceans and seas, uranium is naturally occurring at an average concentration of around 10 –8 M although, as for the earth’s crust, heterogeneities apply . In 1956, Rona et al reported a concentration of uranium between 3.1 and 3.5 μg/kg in seawater at different locations, i.e., in the North Atlantic, the Gulf of Mexico, and in the Straits of Florida . Ku et al reported similar values with a mean concentration of uranium of about 3.3 μg/L .…”

Section: Introductionmentioning

confidence: 96%

Uranium Uptake in Paracentrotus lividus Sea Urchin, Accumulation and Speciation

Reeves

Beccia

Solari

et al. 2019

Environ. Sci. Technol.

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Uranium speciation and bioaccumulation were investigated in the sea urchin Paracentrotus lividus. Through accumulation experiments in a well-controlled aquarium followed by ICP-OES analysis, the quantification of uranium in the different compartments of the sea urchin was performed. Uranium is mainly distributed in the test (skeletal components), as it is the major constituent of the sea urchin, but in terms of quantity of uranium per gram of compartment, the following rating: intestinal tract > gonads >> test, was obtained. Combining both extended X-ray Absorption Spectroscopy (XAS) and time resolved laser induced fluorescence (TRLFS) spectroscopic analysis, it was possible to identify two different forms of uranium in the sea urchin, one in the test, as a carbonato-calcium complex, and the second one in the gonads and intestinal tract, as a protein complex. Toposome is a major calcium-binding transferrin-like protein contained within the sea urchin. EXAFS data fitting of both contaminated organs in vivo and the uraniumtoposome complex from protein purified out of the gonads revealed that it is suspected to complex uranium

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Section: Introductionmentioning

confidence: 96%

Uranium Uptake in Paracentrotus lividus Sea Urchin, Accumulation and Speciation

Reeves

Beccia

Solari

et al. 2019

Environ. Sci. Technol.

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“…Since the samples from all sites were constant with respect to. the AI• and were collected at varying tidal and seasonal conditions, it is reasonable to assume that the AI• will be constant with respect to time.The uranium content of the samples analyzed is somewhat lower than values reported for typical ocean water[Rona et al, 1956]. This may result from the dilution of the coastal waters with terrestrial water, as reflected in remained to allow a second analysis in the event contamination with U • occurred during the first analysis, but agreement of the results of the two analyses substantiated the disparity.…”

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confidence: 72%

U²³⁴/U²³⁸ratios in coastal marine waters and calcium carbonates

Blanchard¹

1965

J. Geophys. Res.

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Water and live molluscan shell samples were collected simultaneously at seven locations on the seacoast of the United States. Samples of silt, water, and shells from an estuary were also included in the study. The water samples were analyzed for U238, U234, calcium, and salinity; the shell samples were analyzed for U238, U234, calcium, and crystal structure. All water samples, regardless of salinity or total uranium content, were found to have uranium activity ratios, Au234/Au238, within the experimental uncertainty of the 1.15 value accepted for an oceanic environment. The results indicate that the normally higher uranium activity ratio of rivers does not increase the ratio of coastal waters above the 1.15 oceanic value. The activity ratios of all except two shell samples analyzed were similar to those of the surrounding seawater and to the oceanic 1.15 value. The application of the results of the study to the determination of geologic age via uranium‐uranium daughter equilibrium is discussed.

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“…The concentration of uranium-238 ( -3 pg per liter) is generally believed to be a conservative property of sea water and, in addition, the 234U/23sU ratio is believed to be constant at about 1.14 (Rona et al, 1956;Wilson et al, 1960;Somayajulu and Goldberg, 1966). However, a number of recent articles have suggested that a significant variation in the uranium to chlorinity ratio exists .…”

Section: Natural Long-lived Nuclidesmentioning

confidence: 94%