1996 Volume 45 Issue 12 Pages 753-760
In order to clarify influence of pH-buffer action of soil on desorption behavior of radionuclides adsorbed on a soil, a batch type desorption experiment, in which a coastal sand adsorbed 60Co was contacted with an aqueous solution of 4, 7 or 10 in pH, was performed.
When pH of the solution became higher, the desorption ratio of 60Co from the sand to the solution decreased, while the abundance ratio of non-cationic 60Co species increased. Relationship between the pH of solution and the desorption ratio of 60Co could been explained by a pH dependency of negative charge density on the sand surface. It was found that the non-cationic 60Co species in the solution was colloidal {60Co (OH) 2} n, which was formed by hydrolysis of 60Co2+ at buffered pH.
