Effect of temperature on the transformation of cadmium fractionation in soil

In this paper, the effect of temperature on the fractionation of heavy metal Cd adding into the soil was researched by the method of chemical sequential extraction in indoor incubation experiment. The results indicate that Cd adding into soil exits in the form of exchangeable fractionation in the temperature of 30 ℃ and 10 ℃, and the activity of Cd in 30 ℃ is stronger than in 10 ℃. Cd exits in the form of residual fractionation during the incubation forepart of -30 ℃ and in the form of exchangeable fractionation during the anaphase when the total concentration of Cd is high. The distribution coefficient of exchangeable fractionation is bigger than other forms in -30 ℃ when the total concentration of Cd is low. The content of bound-organic fractionation is zero during freezing. The Cd content of non-residual fractionation is relatively high and the activity is also strong when the pollution of Cd is serious.