Humic substances in natural waters and their complexation with trace metals and radionuclides: a review. [129 references]

Boggs, S.; Livermore, D.; Seitz, M.G.

doi:10.2172/5569909

Cited by 72 publications

(60 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reduction of solubility with temperature appears to be responsible for increased sorption, but the behavior of radionuclides is also dependent on the type of species and the temperature range (Boggs et al, 1985). For example, the possible soluble oxidized species of Pu, Tc, and Np can form at high temperature (Avogadro and de Marsily, 1984).…”

Section: Colloid Formationmentioning

confidence: 99%

Synthesis report on thermally driven coupled processes

Hardin¹

1997

View full text Add to dashboard Cite

Section: Colloid Formationmentioning

confidence: 99%

Synthesis report on thermally driven coupled processes

Hardin¹

1997

View full text Add to dashboard Cite

“…and llvvic macromolecules) and inorganic microparticulatd colloidal materials that are suspected of acting as vehicles for the facilitated transport of radionuclides and other contaminants of interest (Wobber 1991;Williams et al 1991;, Lieser et al 1990Ramsay 1988;Choppin 1988;Jensen and Jensen 1988;and Boggs et al 1985). If significant size and speciation diversity does exist in the smaller submicron range, then ultrafiltration would seem an appropriate means of Results Table 3.4 Charge speciation and particulate natures of selected radionuclides (1991) separating individual migration species into "purer"…”

Section: Radiochemical Characterization Of Groundwatermentioning

confidence: 99%

The role of organic complexants and microparticulates in the facilitated transport of radionuclides

Schilk¹,

Robertson²,

Abel³

et al. 1996

View full text Add to dashboard Cite

This progress report describes the results of ongoing radiological and geochemical investigations of the mechanisms of radionuclide transport in groundwater at two low-level waste (LLW) disposal sites within the waste management area of the Chalk River Laboratories (CRL), Ontario, Canada These sites, the Chemical Pit liquid disposal facility and the Waste Management Area C solid LLW disposal site, have provided valuable 30-to 40-year-old field locations for characterizing the migration of radionuclides and evaluating a number of recent site performance objectives for LLW disposal facilities. Thii information will aid the NRC and other federal, state, and local regulators, as well as LLW disposal site developers and waste generators, in maximizing the effectiveness of existing or projected LLW disposal facilities for isolating radionuclides fiom the general public and thereby improving the health and safety aspects of LLW disposal.These studies have focused on identifying the physicochemical species of mobile radionuclides in groundwater at these field locations and characterizing their behavior in the sub-surface environment. Field and laboratory studies have shown that the mobile radionuclide species, including 55Fe, @Coy '06Ru, *=Sb, and 23g3%'u, are generally anionic in nature and being sequestered by naturally occurring and/or man-made complexing materials, such as fulvic and humic substances. Ion chromatographic separations of contaminated groundwater have identified a number of individual mobile chemical species of @Co and '06Ru, indicating the presence of a complex mixture of these sequestered radionuclides being transported in the groundwater. Further physico-chemical characterization of these mobile radionuclides using large-volume hollow-fiber ultrafiltration techniques have confirmed that a significant fiaction of the "soluble" radionuclides are present as intermediate molecular weight compounds corresponding to size ranges typical of fulvic and humic organo-metallic macromolecules. Optical spectroscopic techniques for characterizing the organo-metallic radionuclide species have also provided confirmatory evidence of complexation of radionuclides by humic materials.These studies have shown, through the use of multiple state-of-the-art characterization methodologies, the consistent relationship between migrating radionuclides and naturally occurring humic and fulvic materials in CRL groundwater. Their ubiquitous presence in sampled waters, substantial capacity for the complexation of cationic radionuclides under the existing geochemical conditions, and general lack of attraction for most mineral surfaces in the aquifer medium suggest that these species are primarily responsible for the facilitated transport of radionuclides in this region. As the CRL site serves as a viable model for LLW disposal sites in humid environments, the results of this investigation have farreaching implications in the fields of facility design, maintenance, and remediation.On-going field and laboratory studies are con...

show abstract

“…present in wastes [63,70,219] or with natural organic matter (i.e., fulvic and humic acids) eluted from soils ( [151,154,220], see also Chapter 5). A review on complex formation of humic substances with actinides (Th, U, Np, Pu, Am, Cu) and with important cations in natural waters was recently published by Moulin et al [16], These authors presented calculated speciation diagrams for natural system conditions (pH 4-9, and 0.1 to 10 ppm humic substances).…”

Section: Groundwatersmentioning

confidence: 99%

Speciation of Radionuclides in the Environment

Gunten

Beneš

1995

Radiochimica Acta

View full text Add to dashboard Cite

Methods for the determination of the speciation of radionuclides in aerosols, in aquatic solutions, in sediments, soils and rocks are reviewed. At present, most of the results about speciation are deduced from model calculations, model experiments, and separation of species (forms) of radionuclides, e.g., by sequential extraction procedures. Methods of direct determination of speciation of radionuclides (e.g., by laser induced spectroscopy) are in general not yet sensitive enough for a measurement of the very low concentrations of radionuclides in the environment. The methodological part of this paper is followed by a review of the very abundant literature about speciation of important radionuclides in the environment, i.e., in the atmosphere, hydrosphere and lithosphère. The review does not include the biosphere. Literature up to spring 1993 is included (with a few more recent additions).

show abstract

Humic substances in natural waters and their complexation with trace metals and radionuclides: a review. [129 references]

Cited by 72 publications

References 1 publication

Synthesis report on thermally driven coupled processes

Synthesis report on thermally driven coupled processes

The role of organic complexants and microparticulates in the facilitated transport of radionuclides

Speciation of Radionuclides in the Environment

Contact Info

Product

Resources

About