The influence of passivating agent on soil pollution

In this paper, different materials such as phosphogypsum, raw coal and iron slag, which are more concerned in chemical passivation, are selected to mix an efficient and cheap passivation agent to repair Cd and As compound contaminated soil and realize the reuse of solid waste resources. The heavy metals Cd and As are not only toxic to the soil-plant system, but also migrate to animals and humans through the food chain, destroying normal physiological functions, and causing great harm to the human body. The essential functions of the newly developed heavy metal passivator are as follows: • Changed the microscopic morphology of the soil; • Greatly reduce the bioavailability of Cd and As in the soil.