Page "Colloid" Paragraph 88

( limestone, sandstone, granite, ...).

Radionuclides and heavy metals easily sorb onto colloids suspended in water.

Various types of colloids are recognised: inorganic colloids ( clay particles, silicates, iron oxy-hydroxides, ...), organic colloids ( humic and fulvic substances ).

When heavy metals or radionuclides form their own pure colloids, the term " Eigencolloid " is used to designate pure phases, e. g., Tc ( OH )< sub > 4 </ sub >, U ( OH )< sub > 4 </ sub >, Am ( OH )< sub > 3 </ sub >.

Colloids have been suspected for the long-range transport of plutonium on the Nevada Nuclear Test Site.

They have been the subject of detailed studies for many years.

However, the mobility of inorganic colloids is very low in compacted bentonites and in deep clay formations