ADSORPTION AND DESORPTION OF CADMIUM IN TWO TYPICAL SOILS IN NORTHEASTERN CHINA AS AFFECTED BY BENZO-A-PYRENE

In this research, the adsorption and desorption of cadmium (Cd) in two Chinese typical soils (burozem and phaeozem) in the presence and the absence of benzo-a-pyrene (BaP) was studied by batch experiments. The results showed that the adsorption and desorption isotherms of Cd on the two soils were well fitted with the Langmuir model and Freundlich model. Phaeozem had higher adsorption ability of Cd in contrast with burozem because of the higher cushioning capacity of phaeozem. When Cd and BaP coexisted, BaP could affect adsorption and desorption of Cd in burozem and phaeozem. The coexistence of BaP inhibited the adsorption of Cd both in burozem and phaeozem. The desorption of Cd decreased with an increase in the concentration of BaP. The presence of BaP inhibited the desorption of Cd from burozem and phaeozem. The quantities of Cd desorption in phaeozem were lower than those in burozem.