Research On V Transport In Aeolian Sandy Soil

Vanadium is one of the necessary trace elements for animals, but it will also damage the animals if its dose was superfluous. The concentration of vanadium in the environment is increasing and thus will threaten health of human beings. In consequence, it is necessary to investigate the transferring disciplinarian of vanadium in soils. The results will significantly contribute to control and restoration of vanadium contaminated soil.In this study, three different mediums(non-colloid medium, medium comprising of only mineral colloid and medium containing organic medium) were prepared via leaching and oxidation method on aeolian sandy soil. Then, indoor simulator investigations were carried out to examines the migration of colloid and vanadium in different environmental conditions(pH, ionic strength, velocity of flow). The main conclusions are listed as below:1.A positive correlation between the concentration of vanadium and colloid in all the treatments was found. This result illustrated that colloids promotes migration of vanadium in aeolian sandy soil and suggested that colloids acted as the carrier for migration of vanadium in soils.2.The surface character of medium affected the migration of vanadium in soils.Compared with the migration condition of vanadium in three different treated soils in the same velocity of flow ionic strength and pH, the leaching time of vanadium was detected and found that the leaching time of vanadium follows as: untreated aeolian sandy soil > aeolian sandy soil comprising of only mineral colloids > aeolian sandy soil containing no mineral colloids. This phenomenon may be caused by the adsorption ability of different medium surface.3.The velocity of flow has a significant influence on the vanadium migration in the soil.It appears that when using the leacheate treats the untreated aeolian sandy soil, in a range of velocity of flow, an excessive speed of flow velocity goes against the migration of vanadium and colloids in the soil. When leaching the aeolian sandy soil comprising of only mineral colloids and the soil containing no colloids, a low speed of flow velocity promotes the migration of vanadium and colloids in the soil, while high flow speed goes against it.4.The ionic strength is another essential influencing factor of the vanadium migration in the soil. It assumes that when using leacheate treats the untreated soil and the aeolian sandy soil comprising of only mineral colloids, the increasing ionic strength promotes the migrationof vanadium in the soil. When using leaching liquid treats the soil containing no colloids, the decreasing ionic strength promotes the migration of vanadium in the soil.5.The raising pH of the leacheate promotes the migration of vanadium in the soil. When using the vanadium leacheate treats all three types of soil column, the concentration of vanadium in the filtrate goes up as the pH increases.