[Objective] The migration process and feature of CdCl2 in the vertical and horizontal profiles of soil were studied by the stimulating experiment to present the theory for the treatment of significant pollution accident.[Method]The column leaching device was taken to simulate the vertical and horizontal migration of CdCl2 in the soil profile under two-phase rainfall during 16 days.The portable manual control negative pressure pump was taken to extract soil solution sample and the Cd concentration was determined by the atomic absorption spectrophotometer.[Result]During the whole experiment,the obvious horizontal and vertical migration features of CdCl2 appeared.The CdCl2 covered the whole horizontal profile in 0.5 h and the whole vertical profile in 146 hours.The relative variation rate of Cd in the different depth of bulk showed that the rapid passing time differed in the different depths.In the depth of 15,35 and 55 cm,the rapid passing time were about 48,117 and 266 h,respectively.[Conclusion]The simulating device used in this paper could well investigate the vertical and horizontal distribution and migration of contaminant.Under the condition of greater rainfall,the CdCl2 gave priority to the horizontal runoff in the surface soil,followed by the vertical migration.
