Uranium(VI) sorption to hematite in the presence of humic acid

Lenhart, John J.; Honeyman, Bruce D.

doi:10.1016/s0016-7037(99)00269-0

Cited by 192 publications

(145 citation statements)

References 59 publications

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“…They suggested that the sorption/desorption of the humic acids on/from minerals played a major role in the sorption behavior of Np(V). 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.…”

Section: Introductionsupporting

confidence: 81%

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: 81%

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

Zhao¹,

Zavarin²,

Leif³

et al. 2007

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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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“…The interaction depends on the chemical state of the organic material, which can be soluble or associated to mineral particles. Numerous studies on the interaction of actinides with HS in solution are described in the literature [1][2][3][4], but few studies have been devoted to the interaction of actinides with HS-mineral complexes [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of complexed species of Eu in alumina-bound and free polyacrylic acid: A spectroscopic study

Montavon

Hennig

Janvier

et al. 2006

Journal of Colloid and Interface Science

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The speciation of Eu complexed with polyacrylic acid (PAA) and alumina-bound PAA (PAA ads ) was studied at pH=5 in 0.1M NaClO 4 . Structural parameters were obtained from 7 coordination. The results show that the degree of freedom of carboxylate groups is not the same for free or adsorbed PAA. For PAA, the degree of freedom is constrained by the flexibility of the methylene chain. When PAA is adsorbed on alumina, the polymer chains cannot any more be treated as independent chains. One may rather assume formation of aggregates that form an organic layer at the mineral surface presenting a complex arrangement of carboxylate groups.

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Uranium(VI) sorption to hematite in the presence of humic acid

Cited by 192 publications

References 59 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

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

Comparison of complexed species of Eu in alumina-bound and free polyacrylic acid: A spectroscopic study

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