Sorption equilibria in colloid systems and their influence on distribution ratios of trace elements

Lieser, Κ. H.; Peschke, S; Gleitsmann, B.

doi:10.1007/bf01117748

Cited by 10 publications

(12 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…c) There are several possibilities for a dependence of the observed sorption ratio on the V/m ratio under equilibrium conditions: colloid formation [2,3], concentration effects (section 3), and complexation effects (section 4). d) Sorption data without detailed description of the conditions for which they have been measured are not comparable and therefore not very useful.…”

Section: Discussionmentioning

confidence: 99%

“…It was emphasized that only the ratios of one individual species in solution and one individual solid, as given by eqs. (1) and (2) are well-defined quantities [1].…”

Section: Introductionmentioning

confidence: 99%

“…A significant influence of V/m on /?$(obs) could be attributed to the formation of colloids and it could be shown that the various sorption equilibria between solute and colloid, solute and solid and colloid and solid can be responsible for the dependence of the sorption ratio (obs) on V/m, if the colloids are not separated quantitatively from the solution together with the solid [2,3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sorption Equilibria of Radionuclides or Trace Elements in Multicomponent Systems

Lleser

Steinkopff

1989

Radiochimica Acta

View full text Add to dashboard Cite

Sorption equilibria /Multicomponent systems/ Cs / Sr / Ce Summary Several cases of sorption equilibria in multicomponent systems are investigated: (1) Sorption of one species on two solid components (sorption of Cs on natural sediments of varying composition), (2) sorption of one species on different sorption sites (sorption of Cs on a natural sediment in the range of non-linear sorption isotherms at various volume to mass ratios V/m), (3) sorption of two species of one element on the same solid (influence of variations of V/m, of changes of pH, of Eh, and of the concentration of complexing agents).It is shown that in multicomponent systems the observed sorption ratio may depend strongly on the special conditions and that there are several possibilities for a dependence of the observed sorption ratio on V/m'· colloid formation, concentration effects (in the case of non-linear sorption isotherms) and complexation effects.The consequences of the results are discussed.

show abstract

Section: Discussionmentioning

confidence: 99%

“…It was emphasized that only the ratios of one individual species in solution and one individual solid, as given by eqs. (1) and (2) are well-defined quantities [1].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sorption Equilibria of Radionuclides or Trace Elements in Multicomponent Systems

Lleser

Steinkopff

1989

Radiochimica Acta

View full text Add to dashboard Cite

show abstract

“…Calculations of the retardation of radionuclides in the geosphere were based on distribution ratios which were measured by batch experiments or, in some cases, by column experiments. Only recently the attention has been drawn to the possible influences of colloid formation on the behaviour of radionuclides in the geosphere [11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Colloid Formation and Sorption of Radionuclides in Natural Systems

et al. 1986

Self Cite

View full text Add to dashboard Cite

Radionuclides iti the geosphere /Sorption ratios /Colloid formation/Radioactive Cs + ¡Radioactive Sr 2+ /Radioactive Ce 3+ Summary Natural systems comprising sediments and groundwaters of low and of high salinity are investigated with respect to the formation and the influence of coarsely dispersed particles and finely dispersed particles (colloids). Equations are derived for the sorption equilibria in such systems and it is shown that the efficiencies of mutual separation of coarsely dispersed particles, finely dispersed particles and sediments (efficiencies of filtering) strongly influence the sorption ratios that are observed.In groundwater without sediments the formation of colloids of radioactive Ce 3+ is demonstrated, whereas Cs + and Sr ì+ do not form colloids under these conditions, as expected.The amounts of elements and of colloids given off by the sediments into the groundwaters are measured for the samples of low and of high salinity and the influence of agitation is shown.Sorption ratios of radioactive Cs + , Sr î+ , and Ce 3+ are investigated as function of the ratio of the groundwater volume to the mass of the sediment without filtration, after filtration through 0.45 Mm filters and after ultrafiltration. The results are discussed on the basis of the equations derived. It is shown that Cs + ions are sorbed mainly on the clay particles and that the larger amount of these clay particles has grain sizes greater than 0.45 Mm under the experimental conditions of smooth shaking. Sr 2+ ions are mainly sorbed on the sediments with a relatively low sorption ratio. Ce 3+ ions form colloids ("Eigenkolloide") that are retained by ultrafiltration.

show abstract

“…If particles of colloidal dimensions or suspended matter are present or formed, sorption will also depend on the filtration properties of the geosphere for these particles [1]. Colloid formation and filtration effects are investigated in greater detail in a following publication.…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 99%

Sorption of Trace Elements or Radionuclides in Natural Systems Containing Groundwater and Sediments

1986

View full text Add to dashboard Cite

Sorption of radionuclides / Sorption ratio / Sorption mechanisms / Radioactive Cs + ¡Radioactive Sr 2+ /Radioactive Ce 3+ Summary A general formula for the sorption ratio that is observed experimentally in natural systems is presented taking into account three kinds of processes: sorption at the outer surface of the solid particles, sorption in porous particles and one-directional processes such as precipitation or coprecipitation. These various processes as well as the mechanisms and the kinetics of sorption are discussed.The sorption of radioactive Cs + , Sr 2+ and Ce 3+ is studied in two selected natural sediment/groundwater systems, one of low and one of high salinity, under various conditions. Cs + ions are mainly sorbed in clay minerals that are suspended in the groundwater with relatively high sorption ratios, Sr 2+ ions are mainly sorbed on the sediments with relatively low sorption ratios, and Ce 3+ is mainly found in form of colloids or in suspended particles or in coprecipitates. Coprecipitation leads to very high sorption ratios for Ce 3+ . The behaviour of Cs + , Sr 2+ and Ce 3+ is typical for all elements with similar properties.

show abstract

Sorption equilibria in colloid systems and their influence on distribution ratios of trace elements

Cited by 10 publications

References 0 publications

Sorption Equilibria of Radionuclides or Trace Elements in Multicomponent Systems

Sorption Equilibria of Radionuclides or Trace Elements in Multicomponent Systems

Colloid Formation and Sorption of Radionuclides in Natural Systems

Sorption of Trace Elements or Radionuclides in Natural Systems Containing Groundwater and Sediments

Contact Info

Product

Resources

About