摘要
化肥、农药大量施用以及工业废物的排放导致重金属源源不断地排放到环境中,重金属具有不易降解性,对人类健康和环境保护造成严重影响。通过施加改良剂对土壤重金属进行固定或钝化,该方法因易操作、实用值高等特点得以广泛应用。目前,改良剂主要有有机物、碱性物质以及粘土矿物等几类。改良剂能有效降低土壤p H值,提高改良剂与重金属的吸附、络合以及沉淀作用。对重金属污染较重的土壤,单施改良剂效果不显著,利用不同性质的物化改良剂混合搭配成的复合改良剂可以提高土壤改良和重金属钝化的效果。
The application of pesticide, fertilizer and industrial waste emission result in heavy metals to the environment. And it＇s hard to transfer by food chain and also not easy to degradation. So it caused serious influence to human and environmental. The method of fixing and passivation of heavy metals in soil by applying the modifier is widely used because of its simple operation and economical and practical characteristics. At present, the improved agent types mainly include organic matter, alkaline substances, and clay min- erals. The effect of the improved agent was mainly derived from the soil pH and the adsorption, complexation and precipitation of the modified agent itself and heavy metals. In the region where the soil heavy metal pollution is serious, the effect of the application of single modified agents is not very ideal, using the modified agent mixed with different agent can increase the effect to a certain extent.
出处
《天津农业科学》
CAS
2016年第7期5-9,共5页
Tianjin Agricultural Sciences
关键词
重金属
土壤改良
改良剂
heavy metal
soil improvement
improvement agent
