Effects of dissolved organic carbon on the adsorption properties of plutonium in natural waters

Nelson, D.M.; Penrose, W.R.; Karttunen, J.O.; Mehlhaff, Paige.

doi:10.1021/es00132a002

Cited by 93 publications

(34 citation statements)

References 9 publications

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“…There is no evidence in the study area that Pu forms complexes with organic matter or that Pu is enriched in a high-DOM environment as suggested by Nelson, Penrose, Karttunen and Mehlha (1985). Instead, dissolved Pu has a negative correlation with DOC in this study (Fig.…”

Section: Pu Size Fractionation and Partitioningcontrasting

confidence: 49%

Speciation, Mobility and Fate of Actinides in the Groundwater at the Hanford Site

Buesseler¹,

Dai²,

Repeta³

et al. 2003

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Section: Pu Size Fractionation and Partitioningcontrasting

confidence: 49%

Speciation, Mobility and Fate of Actinides in the Groundwater at the Hanford Site

Buesseler¹,

Dai²,

Repeta³

et al. 2003

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“…That is to say, the second step of this pumping process is not always observable because of the rather slow rate of coagulation, while truly dissolved Mn is converted rapidly to colloidal form in the Venice Lagoon. Nelson et al (1985) also reported that COC in natural aquatic systems could inhibit adsorption of reduced plutonium onto suspended sediment particles. However, Moran and Buesseler (1993) reported that the residence time of colloidal 234Th in continental shelf waters off New England was -0.5 d. They suggested that colloid aggregation might not be rate limiting in controlling the scavenging of 234Th and, by analogy, other particle-reactive trace metals.…”

Section: Discussionmentioning

confidence: 98%

Significance of colloids in the biogeochemical cycling of organic carbon and trace metals in the Venice Lagoon (Italy)

Martin

Dai

Cauwet

1995

Limnology & Oceanography

169

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Colloidal organic C and trace metals from the waters of a highly productive coastal environment (the Venice Lagoon, Italy) have been separated by a cross-flow ultrafiltration device. On average, 18% of organic C, 34% of Cd, 46% of Cu, 87% of Fe, 18% of Ni, 58% of Pb, and 54% of Mn which previously would have been considered in the dissolved phase are actually associated with colloidal material. Thus, past studies overestimate the dissolved trace-metal concentration in the nearshore environment.Compared to total concentration, the proportion of the colloidal fraction represents on average 15% of organic C, 18% of Cd, 28% of Cu, 11% of Fe, 11% of Ni, 29% of Pb, and 12% of Mn. This fraction acts differently from the truly dissolved and macroparticulate phases. The behavior of organic C and trace elements during mixing between freshwater and seawater is more complicated than expected when a colloidal fraction is involved. The flocculation of colloids, encountered normally during estuarine mixing, is not very significant on the time scale of mixing in the lagoon. Conversely, the interaction between colloidal and truly dissolved phases seems important. The partitioning of trace metals between different fractions of organic C appears variable, Fe and Mn are preferentially tied to macroparticulate organic matter, and Cu and Cd are preferentially tied to colloidal organic matter in seawater. Truly dissolved organic C appears to be important for Ni. Pb is mainly associated with macroparticulate organic matter at most stations except in the highly productive region where Pb prefers colloidal organic C.

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“…Radionuclide analysis at the same site for samples taken from cavities indicated that substantial fractions of selected nuclides are associated with colloid-sized particles. In another study, Nelson et al 25 reported that colloidal organic carbon was a major factor controlling the distribution of plutonium between the colloidal solid and dissolved phases in natural surface waters.…”

Section: B Association Of Chemicals With Colloidsmentioning

confidence: 99%

Colloid‐enhanced transport of chemicals in subsurface environments: A review

Ouyang

Shinde

Mansell

et al. 1996

Critical Reviews in Environmental Science and Technology

103

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Ample published evidence demonstrates that colloidal particles can act as carriers to enhance the transport of contaminants in subsurface environments. Conventionally, soil and aquifer porous media are considered to have two phases: an immobile solid matrix and a mobile liquid.Published reports indicate that biocolloids, aluminosilicate clay minerals, and organic colloids can migrate to considerable distances during water flow in soils and aquifers. In the presence of such carriers, the system should be perceived as consisting of three phases: a stationary solid matrix phase, a carrier phase, and an aqueous phase. Particle transport through porous media has been clearly demonstrated in filtration studies, but a need exists to investigate the role of colloidal carriers upon contaminant transport in porous media and to model carrier-enhanced migration of contaminants accurately. In order to assess the potential role of colloidal carriers in facilitating chemical transport in porous media, this review was undertaken to investigate (1) the occurrence and stability of colloids in porous media, (2) the association and movement of colloids with chemicals in porous media, (3) models for the transport of colloids in porous media, and (4) models for colloid-enhanced chemical transport in porous media. In addition, suggested areas for future research are included.

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Effects of dissolved organic carbon on the adsorption properties of plutonium in natural waters

Cited by 93 publications

References 9 publications

Speciation, Mobility and Fate of Actinides in the Groundwater at the Hanford Site

Speciation, Mobility and Fate of Actinides in the Groundwater at the Hanford Site

Significance of colloids in the biogeochemical cycling of organic carbon and trace metals in the Venice Lagoon (Italy)

Colloid‐enhanced transport of chemicals in subsurface environments: A review

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