Divalent Metal Cation
Negatively Charged Particle
(Often Colloidial )
Alkaline, Oxidized
Acid, Reducing
Environment
Environment
Coprecipitated
metal
Released
Divalent Metal
Clay mineral
Ferric
oxyhydroxide
layer
Figure 2.1.2 Dissolution of ferric oxyhydroxide layer and release of
coprecipitated metals in an acid, reducing environment
2.1-8