Effects of cellulosic degradation products on uranium sorption in the geosphere

Baston, G. Μ. N.; Berry, Jessica; Bond, K. A.; Boult, K. A.; Brownsword, M.; Linklater, C. M.

doi:10.1016/0925-8388(94)90965-2

Cited by 24 publications

(17 citation statements)

References 5 publications

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“…Similar results for U(VI) sorption to hematite in the presence of DOM were reported by Lenhart and Honeyman (1999). However, Baston et al (1994) reported that in the presence of high concentrations of organic degradation products at neutral pH, significant reduction in uranium sorption was observed and K d values of U(VI) were two orders of magnitude lower than those at pH 12. Plater et al (1992) reported that the complexation of uranium with DOM in mobile river sediments appeared to increase the mobilization of uranium.…”

Section: Introductionsupporting

confidence: 72%

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site

Zhao¹,

Zavarin²,

Leif³

et al. 2007

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The sorption behavior of americium (Am), plutonium (Pu), neptunium (Np), and uranium (U) in perched Rainier Mesa tunnel water was investigated. Both volcanic zeolitized tuff samples and groundwater samples were collected from Rainier Mesa, Nevada Test Site, NV for a series of batch sorption experiments. Sorption in groundwater with and without the presence of dissolved organic matter (DOM) was investigated.Am(III) and Pu(IV) are more soluble in groundwater that has high concentrations of DOM. The sorption K d for Am(III) and Pu(IV) on volcanic zeolitized tuff was up to two orders of magnitude lower in samples with high DOM (15 to 19 mg C/L) compared to samples with DOM removed (< 0.4 mg C/L) or samples with naturally low DOM (0.2 mg C/L). In contrast, Np(V) and U(VI) sorption to zeolitized tuff was much less affected by the presence of DOM. The Np(V) and U(VI) sorption K d s were low under all conditions. Importantly, the DOM was not found to significantly sorb to the zeolitized tuff during these experiment.The concentration of DOM in groundwater affects the transport behavior of actinides in the subsurface. The mobility of Am(III) and Pu(IV) is significantly higher in groundwater with elevated levels of DOM resulting in potentially enhanced transport. To accurately model the transport behavior of actinides in groundwater at Rainier Mesa, the low actinide K d values measured in groundwater with high DOM concentrations must be incorporated in predictive transport models.

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Section: Introductionsupporting

confidence: 72%

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site

Zhao¹,

Zavarin²,

Leif³

et al. 2007

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“…In other words, the living bacteria strongly retains plutonium inside their cell and on the surface of cell in the high bacterial active zone that is rich in organic matters and has a large population of bacteria, but if the bacteria dies there, plutonium trapped by the bacteria will be released from their cell after losing negative charge on the cell surface [7] or cell has degraded. However, the plutonium binding with the degraded cell materials in total plutonium discharged from cell might be weakly retained in soil or sediment, because the plutonium bond with organic materials has a small K d value [1][2][3][4][5][6][7], Finally, we can conclude that the probability of production of mobile plutonium in soil and sediment is caused by the death of bacteria, products in bacterial metabolisms and biochemical degradation of natural organic materials.…”

Section: Correlation Between the Plutonium Kd Value And Bacterial Actmentioning

confidence: 99%

“…Judging from these preferable conditions for the production of mobile plutonium, the sediment environment in the Nishiyama reservoir was advantageous, because it is rich in organic materials and had a high bacterial activity under strong anaerobic condition because it receives much wastewater from the surrounding human activity. Since major organic materials accumulated at the bottom of the reservoir consisted of cellulosic materials originating from plant tissues, plutonium possibly changes to a soluble form by binding with the degraded cellulose [3][4][5].…”

Section: Detection Of Mobile Plutonium In the Environmentmentioning

confidence: 99%

“…Increase in the content of dissolved organic carbon in natural water causes a decrease of the K d value of radionuclides in soil and sediment [1,2], A UK research group reported that cellulosic degraded materials drastically enhanced the solubility of plutonium in a highly alkaline solution [3][4][5]. Some microorganisms (bacteria and fungi) in soil have the ability to uptake plutonium in their cell and to alter the plutonium into a soluble form in cell in solution [6], Wildung and Garland [7] reported that the complexes of plutonium produced by bio-transformation tended to have higher molecular weight than a simple complex such as plutonium-DTPA.…”

Section: Introductionmentioning

confidence: 99%

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Probability of Production of Mobile Plutonium in Environments of Soil and Sediment

Mahara

Kudō

1998

Radiochimica Acta

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Mobile plutonium was found in the bottom sediment in the Nishiyama reservoir in Nagasaki after more than 40 years from deposition of local fallout released in the explosion of the ABomb in 1945. Less than 10% of total deposited plutonium had turned into a mobile form in the bottom environment of the reservoir. The environmental conditions at bottom sediment is expected to be rich organic materials and high bacterial population under anaerobic conditions. Anaerobic bacteria have a high ability to uptake plutonium into cell during their growth. The K d of plutonium to living bacteria is 20 times greater than the dead bacteria under anaerobic conditions. The results of field observations combined with empirical laboratory tests indicate that mobile plutonium in soil and sediment may be affected not only by binding with dissolved natural organic materials but also by the number of living anaerobic bacteria.

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“…These materials, and specifically their breakdown products, can potentially contribute to both UO 2þ 2 immobilization and mobilization. For example, these breakdown products include short-chain fatty acids that can potentially enhance UO 2þ 2 mobility through chelation [5][6][7]. Mechanisms of UO 2þ 2 immobilization include UO 2þ 2 accumulation within biomass metabolizing the cellulose and cellulosic breakdown products [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

UO speciation determines uranium toxicity and bioaccumulation in an environmental Pseudomonas sp. isolate

VanEngelen

Field

Gerlach

et al. 2010

Enviro Toxic and Chemistry

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In the present study, experiments were performed to investigate how representative cellulosic breakdown products, when serving as growth substrates under aerobic conditions, affect hexavalent uranyl cation (UO(2) (2+)) toxicity and bioaccumulation within a Pseudomonas sp. isolate (designated isolate A). Isolate A taken from the Cold Test Pit South (CTPS) region of the Idaho National Laboratory (INL), Idaho Falls, ID, USA. The INL houses low-level uranium-contaminated cellulosic material and understanding how this material, and specifically its breakdown products, affect U-bacterial interactions is important for understanding UO(2) (2+) fate and mobility. Toxicity was modeled using a generalized Monod expression. Butyrate, dextrose, ethanol, and lactate served as growth substrates. The potential contribution of bicarbonate species present in high concentrations was also investigated and compared with toxicity and bioaccumulation patterns seen in low-bicarbonate conditions. Isolate A was significantly more sensitive to UO(2) (2+) and accumulated significantly more UO(2) (2+) in low-bicarbonate concentrations. In addition, UO(2) (2+) growth inhibition and bioaccumulation varied depending on the growth substrate. In the presence of high bicarbonate concentrations, sensitivity to UO(2) (2+) inhibition was greatly mitigated, and did not vary between the four substrates tested. The extent of UO(2) (2+) accumulation was also diminished. The observed patterns were related to UO(2) (2+) aqueous complexation, as predicted by MINTEQ (ver. 2.52) (Easton, PA, USA). In the low- bicarbonate medium, the presence of positively charged and unstable UO(2) (2+)-hydroxide complexes explained both the greater sensitivity of isolate A to UO(2) (2+), and the ability of isolate A to accumulate significant amounts of UO(2) (2+). The exclusive presence of negatively charged and stable UO(2) (2+)-carbonate complexes in the high bi-carbonate medium explained the diminished sensitivity of isolate A to UO(2) (2+) toxicity, and limited ability of isolate A to accumulate UO(2) (2+).

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Effects of cellulosic degradation products on uranium sorption in the geosphere

Cited by 24 publications

References 5 publications

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site

Actinide Sorption in Rainier Mesa Tunnel Waters from the Nevada Test Site

Probability of Production of Mobile Plutonium in Environments of Soil and Sediment

UO speciation determines uranium toxicity and bioaccumulation in an environmental Pseudomonas sp. isolate

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