Adsorption, desorption, potential and selective distribution op heavy metals in selected soils of japan

Abstract

Adsorption, desorption, potential and selective distribution of Cu, Zn, Cd, Pb and Ni were investigated in three typical soils of Japan under flooded condition. The results indicate that the sorption of all heavy metals was linear upto the maximum concentration (500 micrograms/g soil) employed in the present studies in all the soils. The magnitude of sorption in general was in the order of Pb greater than Cu greater than Zn greater Cd greater than Ni. The adsorption coefficients showed wide variation among different soils as well as metal ions. The hysteresis of sorption and desorption by KN03 was well pronounced for both the metal ions and the soils. The desorption rate was greater than the fixation rate indicating the predominance of the chemosorption over physical processes. The major portion of sorbed metals were retained in the unextractable form, which over all accounted for more than 50% of the sorbed metals.