土壤pH值对土壤多环芳烃纵向迁移影响的模拟实验研究

Simulation Experiments on Influences of pH Level on the Vertical Migration of Polycyclic Aromatic Hydrocarbons in Soils

摘要: 影响土壤多环芳烃（PAHs）纵向迁移行为的环境因素很多。文章以氧化钙和冰乙酸改变采自徐州土壤的pH值水平，人工装填土柱进行纵向淋滤试验，研究pH值对土壤PAHs纵向迁移行为的影响。结果表明，土壤pH值的变化加强了PAHs在土柱中的纵向淋滤能力，表层土壤中的PAHs可迅速向底层转移；不同种类的PAHs淋滤特性表现不同，pH值增加更能增强低环PAHs的迁移淋滤能力，pH值降低则更能促进高环PAHs从土壤表层向深部迅速迁移。

Abstract: The vertical migration behaviors of polycyclic aromatic hydrocarbons (PAHs) in soils are influenced by a number of factors. To study the effect of pH on the vertical migration of PAHs in soils, soil samples collected from Xuzhou were loaded artificially in the columns and adjusted to different pH levels with CaO and HAc. And deionized water was used as leaching solution. The results showed that PAHs in the soil columns with different pH values had different vertical migration behaviors. Low ring PAHs had strong vertical migration capability in soil columns with higher pH level. In contrast, high ring PAHs had strong vertical migration capability in soil columns with lower pH level.