Humic colloid-borne migration of uranium in sand columns

Artinger, Robert; Rabung, Thomas; Kim, J.I; Sachs, Susanne; Schmeide, Katja; Heise, Katja; Bernhard, Gert; Nitsche, H.

doi:10.1016/s0169-7722(02)00032-3

Cited by 108 publications

(49 citation statements)

References 15 publications

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“…Under acidic pH, HA strongly adsorbs onto mineral surfaces (10,15,16), and the adsorbed HA in turn complexes and immobilizes contaminant metal ions such as UO 2 2+ , Cu 2+ , Cd 2+ (9, [17][18][19]. At neutral and slightly alkaline pH conditions, HA adsorption on the mineral surfaces becomes weaker and the HA in aqueous solution form complexes or colloids with U(VI) that enhance mobility of U(VI) (11,18,20,21). Tipping et al (23) suggested that new and high-affinity metal complexation sites are created when HA adsorbed to goethite.…”

Section: Department Of Energy (Doe) Weapon Facilities Including the Smentioning

confidence: 99%

Method to Attenuate U(VI) Mobility in Acidic Waste Plumes Using Humic Acids

Wan

Dong

Tokunaga

2011

Environ. Sci. Technol.

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Abstract. Acidic uranium (U) contaminated plumes have resulted from acid-extraction of plutonium during the Cold War and from U mining and milling operations. A sustainable method for in-situ immobilization of U under acidic conditions is not yet available. Here, we propose to use humic acids (HAs) for in-situ U immobilization in acidic waste plumes. Our laboratory batch experiments show that HA can adsorb onto aquifer sediments rapidly, strongly and practically irreversibly. Adding HA greatly enhanced U adsorption capacity to sediments at pH below 5.0. Our column experiments using historically contaminated sediments from the Savannah River Site under slow flow rates (120 and 12 m/y) show that desorption of U and HA were non-detectable over 100 pore-volumes of leaching with simulated acidic groundwaters.Upon HA-treatment, 99% of the contaminant [U] was immobilized at pH < 4.5, compared to 5% and 58% immobilized in the control columns at pH 3.5 and 4.5, respectively. These results demonstrated that HA-treatment is a promising in-situ remediation method for acidic U waste plumes. As a remediation reagent, HAs are resistant to biodegradation, cost effective, nontoxic, and easily introducible to the subsurface.2

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Section: Department Of Energy (Doe) Weapon Facilities Including the Smentioning

confidence: 99%

Method to Attenuate U(VI) Mobility in Acidic Waste Plumes Using Humic Acids

Wan

Dong

Tokunaga

2011

Environ. Sci. Technol.

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“…The large number of ionizable functional groups in humic substances, mainly carboxylic and phenolic groups, results in an appreciable ability to form stable complexes with heavy metal cations (Abate and Masini 2002). Since humic acids are soluble, they influence the migration of cations in the environment (Artinger et al 2002). They play an important role in speciation, transport, and deposition of compounds ranging from metal ions to lipophilic compounds (MacCarthy 1989;Livens 1991;Tipping 2002;Tipping et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Complexation Study of Humic Acids Extracted from Forest and Sahara Soils with Zinc (II) and Cadmium (II) by Differential Pulse Anodic Stripping Voltammetry (DPASV) and Conductimetric Methods

Terbouche

Djebbar

Benali-Baïtich

et al. 2010

Water Air Soil Pollut

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The complexation of heavy metals, present in their dissolved state at relevant trace levels, with new humic acids (HAs) isolated from Yakouren forest (YHA) and Sahara (Tamenrasset: THA) soils has been studied by differential pulse anodic stripping voltammetry (DPASV) at a hanging mercury drop electrode and conductimetry methods. After extraction and purification, humic acids were characterized by elemental analyses, atomic absorption spectroscopy, FT-IR, and solution state 13 C-NMR. Taking Zn(II) and Cd(II) as examples, the aim of this study was to gain direct information on the general level of importance of humic acids for the speciation of certain heavy metals in soil to determine the complexing capacities of AHs and stability constant of the complexes formed with these metal ions and to compare the complexation capacity of forest and Sahara soils with the commercial humic acid and other published AHs. The results determined by conductimetry method are interpreted using an excess function (Δk) which related the conductivity of the mixture and of the separated components. A positive value of this function is obtained. It indicates the complexation of humic acids with metallic ions. The DPASV method was used for determining metal ion complexing capacities and stability constants of metal ion complexes of HAs in solution at pH 7. In both types of soils, the commercial humic acid (CHA) is less efficient in complexing Zn(II) and Cd(II) than THA and YHA and the complexing capacity (CC M ) decreases in the order: THA > YHA > CHA. In general, the results of complexing capacity for all humic acids and stability constants of Zn(II) and Cd(II) complexes found by DPASV method showed good correlation with those of conductimetry method. CC M of THA and YHA calculated by DPASV were higher than those of CHA and the other natural HAs published in the literature at pH 7 basing on these results.

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“…Fe-and Al-oxides/hydroxides, clay and quartz) under different chemical conditions (pH, ionic strength, presence of different complexing ligands, total quantity of uranium, etc) are available. All the studies involving silica or quartz revealed a more or less strong impact of the solution composition on the adsorption of uranyl (Kohler et al 1996;Jung et al 1999;Artinger et al 2002;Hongxia and Zuyi 2002;Davis 2001;Pathak and Choppin 2006;Mibus et al 2007;Gabriel et al 2001;Zuyi et al 2000;Pathak and Choppin 2007a, b;Zuyi et al 2004). Because of the relatively easy procedure, batch experiments are the common way to study the adsorption behaviour of e.g.…”

Section: Introductionmentioning

confidence: 99%

Uranyl Retention on Quartz—New Experimental Data and Blind Prediction Using an Existing Surface Complexation Model

Huber

Lützenkirchen

2009

Aquat Geochem

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The adsorption behaviour of uranyl onto seven different samples of quartz was studied in batch experiments. Sea-sand (0.1-0.3 mm), Fil-Pro 12/20 (1-2 mm) and five Min-U-Sil samples with smaller particle sizes (5, 10, 15, 30 and 40 lm) were used. The uptake curves show ''pH adsorption edges'' in the range of pH 4-5. A good agreement of the new data with literature data was found when plotting surface-normalised distribution coefficients versus pH. Differences in the adsorption behaviour for pre-treated and untreated sea-sand samples were detectable resulting in a shift of the pH edge to higher pH values after treatment. A literature surface complexation model was applied for blind predictions of the experimental results. The simulations described the experimental observations quite well for the Min-U-Sil samples. For the two coarser quartz samples, the calculated over-predictions were explained by the larger-than-expected measured specific surface area and measurable amounts of associated minerals, for Fil-Pro 12/20 and seasand, respectively. Dissolution of the samples was studied as a function of pH. After 5 days, the measured Si concentrations were all higher than equilibrium quartz solubilities, but lower than those of amorphous silica. With increasing pH, dissolved silica increased. This strongly suggests that formation of dissolved uranyl-silicato complexes have to be considered based on measured silica concentrations.

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Humic colloid-borne migration of uranium in sand columns

Cited by 108 publications

References 15 publications

Method to Attenuate U(VI) Mobility in Acidic Waste Plumes Using Humic Acids

Method to Attenuate U(VI) Mobility in Acidic Waste Plumes Using Humic Acids

Complexation Study of Humic Acids Extracted from Forest and Sahara Soils with Zinc (II) and Cadmium (II) by Differential Pulse Anodic Stripping Voltammetry (DPASV) and Conductimetric Methods

Uranyl Retention on Quartz—New Experimental Data and Blind Prediction Using an Existing Surface Complexation Model

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