腐植物质钝化和活化土壤重金属的防污染作用

Effects of Humic Substances on Preventing Soil from Heavy Metals Pollution through Passivating and Activating Approaches

叙述了腐植酸与重金属作用的机理,即腐植酸通过络合、螯合、还原作用使重金属固定在土壤颗粒表面,从而影响它们的迁移并减少了重金属水溶态,降低其毒性。介绍了腐植酸在治理土壤重金属污染中的应用和相应的净化效果以及影响腐植酸吸附重金属的因素,如土壤类型、pH值、作用时间等,并指出腐植酸在降低土壤重金属活性(毒性)作用中存在的问题及发展趋势。

The paper discusses the reaction mechanisms between humic acid and heavy metals. By complexation, chelation and reduction, hnmic acid makes heavy metal fixed on the soil surfaces, as a result, their migration is affected while the percentage of soluble form of heavy metals is decreased, and toxicity is reduced. Furthermore, the application of humic acids for governing pollution of heavy metals in soil and the cleaning efficiency are introduced. Some factors affecting humic acids to adsorb heavy metals, such as the types of soil, pH values, reaction time et al are introduced, too. Finally, some problems and research tendency of humic acid for reducing heavy metals activaty（toxicity） in soil are indicated in the paper.