Simulation Experiment Of Heavy Meatal In Three Typical Soils Of Shanxi

In this paper we use environment geochemistry method to investigate the pollute actuality and disciplinarian of the topsoil in Shanxi province, The three typical soils were came from Da Tong,TaiYuan and LinFen. There are three parts in the experiment:(1)The absorption-desorption experiment of Cd,Pb and Hg in the three typical soils, compete absorption between these heavy metals; (2)The transport experiment of Cd,Pb and Hg in the three saturation soil poles; (3)speciation analysis of Cd,Pb and Hg in the three typical soils. The main results showed as follows:1. According to the adsorption experiments of the three heavy meta(lCd,Pb,Hg)in the three types of soil we learn that, the adsorbability of the three types of soil is :Taiyuan soil > Linfen soil >Datong soil, the desorption ability order is Datong soil > Linfen soil > Taiyuan soil. and the adsobability of the three heavy metal is Pb>Cd>Hg, the desorption ability order is Hg>Cd>Pb.2. Under the normal temperature and normal press we use four types of adsorption mode to fit the experiments ,the results shows that the Langmuir equation is suitable to describe the three types of soil to adsorb Cd and Hg while the more suitable equation to adsorb Pb is Henry equation.3. The presence of Zn2+ or Pb2+ will restrain the soil absorb Cd2+; Humic acid could restrain the soil absorb Pb2+, but this restrain current was not distinctness for the Cd2+ in ours experimental.4. In the transport simulation experiment, the transport-speed order of the three types of soil is Datong soil> Taiyuan soil>Linfen soil. Consequently we lean that the heavy metal transferred easily in the sand and difficulty in the clay. For the heavy metal the Hg is transferred easily and the Pb is difficulty.5. According to the speciation analysis, most of the elements are stable, they exist mainly as reducible state ;the speciation of Cd are Acid Extractable state and reducible state; the speciation of Pb is reducible state; the reducible state and the residual state of Hg are take a big account when the reducible state and Acid Extractable state are less, there even no soluble state.