Lead (II) and zinc (II) were chosen for testing heavy metal adsorption.
Two different rocks were used as test materials: natural rhyolite tuff and a porous limestone from Hungary.
Lead (II) and zinc (II) ions could be removed from aqueous solutions by bulk and powdered rhyolite tuff and porous limestone.
Lithologies are recommended to be used for removing heavy metals in environmental processes, such as treating of groundwater.