Study on the kinetics of cerium(III) adsorption-desorption on different soils of China

The kinetics of Ce(III) adsorption-desorption on four typical soils in Chin a has been studied by using the batch method with the radioactive nuclide C e-141. Results indicated that Ce(III) adsorption was rapid and nearly finis hed in less than 0.5 min. Desorption procedure was about completed in 1-30 min in the tested soils. Ce(III) desorption equilibrium times vary with dif ferent soils. The amounts of Ce(III) desorption on different soils in the s ame time were different. The Elovich equation proved to be the best models for fitting the data of Ce(III) desorption reactions in fluvoaquic soil and black soil; and the parabolic-diffusion equation was the best model in red earth and loess soil. (C) 2001 Elsevier Science Ltd. All rights reserved.