Description

Sorption is a general term encompassing processes in which one substance (e.g. part of the EBS) takes up or holds a dissolved species (e.g. radionuclide) by physico-chemical interactions, thereby retarding its transport. For example, radionuclides can sorb on the surfaces of open channels within water-conducting features and also on the surfaces of pores accessible by matrix diffusion

Category

Category of FEP

Supercontainer EBS

Sub-category

Sub-category of FEP

Chemical processes

Ondraf Niras FEP Number

Ondraf Niras FEP Number

25

FEP Effects

Description of FEP Effects

Sorption affects the rate at which radionuclides migrate through the EBS. The more a species is sorbed the slower it leaves the EBS. Sorption and the extent to which radionuclides are retarded depend on elemental concentrations and on the properties of the solid-water system under consideration. Changes in mineralogy and water chemistry may affect the amount of sorption.

NEA TN2 IFEP Reference(s)

Related IFEPs from the NEA TN2 List of Proposed IFEP Revisions [NEA/RWM/R(2013)8]

2.4.1.5 Sorption and desorption (waste form). 2.5.2.6 Sorption and desorption (waste package). 3.3.2.6 Sorption and desorption (GDF).