Determination of distribution coefficient of uranium from physical and chemical properties of soil

Manoj, S.; Thirumurugan, M.; Elango, L.

doi:10.1016/j.chemosphere.2019.125411

Cited by 20 publications

(8 citation statements)

References 25 publications

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“…For U, the estimated K d−desorb values in the contaminated Tims Branch sediments were of the same magnitude as those of previously measured values at other wetlands on the SRS [28]. Our observed U K d−desorb values (Table 3) were typically higher than those measured in several different environments (e.g., 71 L/kg to 390 L/kg at Karnataka, India, [53]; 91 at Tajikistan, [52]; and 276-2249 L/kg at forest sites at Los Alamos National Laboratory, [54]). Therefore, in contrast to some environments where U is quite mobile, such as carbonate systems, the relatively large K d−desorb values measured in this study suggest that the U in Tims Branch watersheds will largely remain attached to the sediments, providing quantitative data for understanding why 94% of the inventory of U remains in this wetland study site 50 years after U release into the nearby stream [11].…”

Section: Solid-phase Distribution Of Ni and Usupporting

confidence: 85%

Uranium and Nickel Partitioning in a Contaminated Riparian Wetland

Lin,

Boyanov,

O’Loughlin

et al. 2024

Water

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Uranium (U) and nickel (Ni) released 50 years ago have been immobilized in the Tims Branch wetlands located on the Savannah River Site in the United States. Sediments were collected from seven locations to identify the factors responsible for this attenuation. Ni and U contents in the solids were significantly correlated, suggesting that depositional as opposed to chemical processes contributed to their spatial distribution. Based on sequential extractions, 63 ± 16% of the U was partitioned into the organic fraction, whereas Ni was distributed between several sediment fractions. An inverse pH-organic matter (OM) correlation and positive correlations of OM with total U and organic-bound U/Ni suggest that increased OM preservation and binding to the mineral surfaces were likely responsible for Ni- and especially U-sediment retention (Tims Branch pH = 4.84 ± 0.68). EXAFS analysis indicated the predominance of U(VI) coordinated with clay minerals (~65%), together with ~35% coordinated to either OM (in areas with elevated OM levels) or iron oxides. The desorption-Kd coefficients of U (3972 ± 1370 L/kg) and Ni (30 ± 8 L/kg) indicate that dissolved Ni poses a greater long-term risk than dissolved U for migrating downstream. This study suggests that a delicate balance of geochemical properties controls whether wetlands behave as sinks or sources of contaminants.

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Section: Solid-phase Distribution Of Ni and Usupporting

confidence: 85%

Uranium and Nickel Partitioning in a Contaminated Riparian Wetland

Lin,

Boyanov,

O’Loughlin

et al. 2024

Water

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“…20 Dent et al (1992) In the case of composite minerals, the above studied methodology can be applied. This is confirmed in Manoj et al (2020) work, log Kd increases up to pH 6 after a plateau it gradually decreases for higher pH (see data in Tables 5 and 6). To complete this study it must be mentioned that the model presented is unfortunately not designed to deal with uranium sorption on calcite.…”

Section: Comparison Of Simulated and Experimental Sorption Datasupporting

confidence: 81%

Simulating uranium sorption onto inorganic particles: The effect of redox potential

Degueldre

McGowan

2020

Journal of Environmental Radioactivity

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An analytical expression is proposed to simulate the effects of pH and redox potential (E) on the sorption of uranium onto model inorganic particles in aquatic environments instead of following an experimental approach providing a list of empirical sorption data. The expression provides a distribution coefficient (Kd) as function of pH, E and ligand concentration (complex formation) applying a surface complexation model on one type of surface sites (>SuOH). The formulation makes use of the complexation and hydrolysis constants for all species in solution and those sorbed at the surface, using correlations between hydrolysis constants and surface complexation constants, for the specific sorption sites. The model was applied for the sorption of uranium onto aluminol, iron hydroxide and silanol sites, mimicking respectively 'clean' clay or 'dirty' clay and 'clean' sand or 'dirty' sand ('dirty' referring to iron hydroxide contaminated), in absence or presence of carbonates in solution. The calculated distribution coefficients are very sensitive with the presence or absence of carbonates. The Kd values obtained by applying the model are compared with values reported in the literature for the sorption of uranium onto specific adsorbents. It is known that in surface water, U(VI) and its hydroxides are the primary stable species usually observed. However, reduction to U(IV) is possible and may be simulated during sorption or when the redox potential (E) decreases.Similar simulations are also applicable to study the sorption of other redox sensitive elements.

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“…The soil is a grey desert soil. Soil properties are shown in Table 1 ( Manoj et al, 2020 ). B. campestris seeds (variety Huayouza 82) were obtained from Huazhong Agricultural University (Wuhan, China).…”

Section: Methodsmentioning

confidence: 99%

Transcriptomic and Metabolomic Analyses Reveal the Differential Regulatory Mechanisms of Compound Material on the Responses of Brassica campestris to Saline and Alkaline Stresses

Hong

Chang

et al. 2022

Front. Plant Sci.

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Oilseed rape not only has the function of improve saline and alkaline soils, but also alleviate the local feed shortage. However, medium- and high-degree soil salinization and alkalinization always inhibit the growth of oilseed rape. Studies have shown that compound material can improve the tolerance to saline and alkaline stress of crops, but the difference in the regulation mechanism of compound material on oilseed rape in saline and alkaline soils is not clear. This study explored the difference through determining the leaf ion contents, physiological indexes, transcriptomics, and metabolomics of oilseed rape in salinized soil (NaCl 8 g kg−1) and alkalinized soil (Na2CO3 8 g kg−1) at full flowering stage, respectively after the application of compound material. The results showed that in salinized and alkalinized soil, the compound material upregulated the genes related to the regulation of potassium ion transport, and changed the amino acid metabolic pathway, which reduced the contents of Na+, malondialdehyde (MDA), and relative conductivity (REC) in leaves, and increased the contents of K+ and Mg2+ and the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT). However, there were differences in the regulation mechanism of compound material in salinized and alkalinized soil. In salinized soil, the compound material improved the tolerance of oilseed rape to saline stress by upregulating transcription factors mannose-1-phosphate guanylyltransferase (GPMM) and Glutamine--fructose-6-phosphate transaminase (GFPT) and downregulating phosphomannomutase (PMM) to change nucleotide metabolism pathway and lipid metabolism pathway. In alkalized soil, the compound material improved the tolerance of oilseed rape to alkaline stress by upregulating transcription factors Phenylalanine ammonia lyase (PAL) to change the biosynthesis pathway of other secondary metabolites. Therefore, the compound material can improve the tolerance of oilseed rape to saline and alkaline stress by regulating the genetic adaptability and apparent plasticity, but the mechanisms were different. This study provides a practical method for the ecological environment restoration and the development of animal husbandry.

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Determination of distribution coefficient of uranium from physical and chemical properties of soil

Cited by 20 publications

References 25 publications

Uranium and Nickel Partitioning in a Contaminated Riparian Wetland

Uranium and Nickel Partitioning in a Contaminated Riparian Wetland

Simulating uranium sorption onto inorganic particles: The effect of redox potential

Transcriptomic and Metabolomic Analyses Reveal the Differential Regulatory Mechanisms of Compound Material on the Responses of Brassica campestris to Saline and Alkaline Stresses

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