Effects of humic substances on the migration in a sandy aquifer: column experiments with Gorleben groundwater/sediment systems

Artinger, Robert; Kienzler, Bernhard; Schüßler, W.; Kim, J.I

doi:10.1016/s0169-7722(98)00124-7

Cited by 123 publications

(104 citation statements)

References 13 publications

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“…Humic colloids are stable and occur in concentrations up to 0.4 g L -1 in dilute, shallow groundwaters overlying the Gorleben test site in Germany (Buckau et al, 2000). Humic substances have experimentally been shown to strongly complex the trivalent actinides (Czerwinski et al, 1996;Artinger et al, 1998;Morgenstern et al, 2000); Th(IV) (Nash and Choppin, 1980); U(VI) and probably U(IV) (Czerwinski et al, 1994;Zeh et al, 1997); and Np(V) (Kim and Sekine, 1991;Rao and Choppin, 1995;Marquardt et al, 1996;Marquardt and Kim, 1998) at mildly acidic to neutral pH. Under basic conditions, actinidehumic substance complexation is strongly a function of the carbonate concentration, because carbonate competes effectively with the humic acid as a ligand (Zeh et al, 1997;Unsworth et al, 2002).…”

Section: Microbial and Humic Colloidsmentioning

confidence: 99%

Environmental geochemistry of radioactive contamination.

Bryan¹,

Siegel²

2003

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This report attempts to describe the geochemical foundations of the behavior of radionuclides in the environment. The information is obtained and applied in three interacting spheres of inquiry and analysis: 1) experimental studies and theoretical calculations, 2) field studies of contaminated and natural analog sites and 3) model predictions of radionuclide behavior in remediation and waste disposal. Analyses of the risks from radioactive contamination require estimation of the rates of release and dispersion of the radionuclides through potential exposure pathways. These processes are controlled by solubility, speciation, sorption, and colloidal transport, which are strong functions of the compositions of the groundwater and geomedia as well as the atomic structure of the radionuclides.The chemistry of the fission products is relatively simple compared to the actinides. Because of their relatively short half-lives, fission products account for a large fraction of the radioactivity in nuclear waste for the first several hundred years but do not represent a long-term hazard in the environment. The chemistry of the longer-lived actinides is complex; however, some trends in their behavior can be described. Actinide elements of a given oxidation state have either similar or systematically varying chemical properties due to similarities in ionic size, coordination number, valence, and electron structure. In dilute aqueous systems at neutral to basic pH, the dominant actinide species are hydroxy-and carbonato-complexes, and the solubility-limiting solid phases are commonly oxides, hydroxides or carbonates. In general, actinide sorption will decrease in the presence of ligands that complex with the radionuclide; sorption of the (IV) species of actinides (Np, Pu, U) is generally greater than of the (V) species.The geochemistry of key radionuclides in three different environments is described in this report. These include: 1) low ionic strength reducing waters from crystalline rocks at nuclear waste research 4 sites in Sweden; 2) oxic water from the J-13 well at Yucca Mountain, Nevada, the site of a proposed repository for high level nuclear waste (HLW) in tuffaceous rocks; and 3) reference brines associated with the Waste Isolation Pilot Plant (WIPP). The transport behaviors of radionuclides associated with the Chernobyl reactor accident and the Oklo Natural Reactor are described. These examples span wide temporal and spatial scales and include the rapid geochemical and physical processes important to nuclear reactor accidents or industrial discharges as well as the slower processes important to the geologic disposal of nuclear waste.Application of geochemical information to remediating or assessing the risk posed by radioactive contamination is the final subject of this report. After radioactive source terms have been removed, large volumes of soil and water with low but potentially hazardous levels of contamination may remain. For poorly-sorbing radionuclides, capture of contaminated water and removal of radi...

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Section: Microbial and Humic Colloidsmentioning

confidence: 99%

Environmental geochemistry of radioactive contamination.

Bryan¹,

Siegel²

2003

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“…carbon and radioactive activity for each filtrate corresponding to a fraction size. Semi-quantitative information is given on speciation, each size class corresponding to particular organic and inorganic complexes and species [2,4,27,28,29]. At the ending of each column leaching, a counting of radioactive activity is made on soil slices to determine the final contamination profile, either by scanning or by standard methods after freezing of the column and slicing.…”

Section: Storage and Analytical Proceduresmentioning

confidence: 99%

“…The behaviour of actinides in terms of sorption/desorption properties, speciation and migration have been well studied in the context of deep nuclear waste repositories [1,2]. Within this framework the role of colloids and organic matter (humic acids) in the complexation and migration of actinides in groundwater/geological media have been clearly demonstrated [3,4]. Similar observations have been evidenced in subsurface aquifer systems [5] and ought to apply to the rhizosphere, as a porous media containing organic matter, though it has not yet been studied.…”

Section: Introductionmentioning

confidence: 99%

Towards a more comprehensive modelling of the behaviour of transuranic elements in agricultural soils: Experimental procedure for the study of the sorption/desorption parameters and speciation of transuranic actinides in the rhizosphere

et al. 2002

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“…Dissolved organic ligands competing with the soil matrix for metal binding can also accelerate metal transport (Artinger et al, 1998). A number o f investigations have demonstrated that significant correlation between organic carbon content and As distribution suggests organic matter plays a significant role in controlling As transport.…”

Section: Facilitated Arsenic Transportmentioning

confidence: 99%

“…In most cases, DOM is found to facilitate metal transport in aqueous systems. DOM competing with the soil matrix for metal binding can also accelerate metal transport (Artinger et al, 1998). A…”

Section: Introductionmentioning

confidence: 99%

Natural organic matter and colloid-facilitated arsenic transport and transformation in porous soil media

Chen¹

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Effects of humic substances on the migration in a sandy aquifer: column experiments with Gorleben groundwater/sediment systems

Cited by 123 publications

References 13 publications

Environmental geochemistry of radioactive contamination.

Environmental geochemistry of radioactive contamination.

Towards a more comprehensive modelling of the behaviour of transuranic elements in agricultural soils: Experimental procedure for the study of the sorption/desorption parameters and speciation of transuranic actinides in the rhizosphere

Natural organic matter and colloid-facilitated arsenic transport and transformation in porous soil media

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