多环芳烃在中国两种典型土壤中的吸附和解吸行为研究

采用批量实验的方法,研究了多环芳烃类有机化合物萘和菲在两种中国典型土壤样品(草甸土和黑土)中的吸附和解吸行为,并用一种新型解吸模型--"双元平衡解吸(DED)模型"对解吸行为进行了预测.结果表明,萘和菲在两种土壤中的吸附符合传统的线性模型,解吸行为则表现出明显的滞后现象,且DED模型的预测值与实验结果相吻合.DED模型能够利用简单的理化参数更加准确地定量描述憎水性有机污染物的解吸行为,该模型可为我国的土壤风险评价和土壤环境质量标准的制定等工作提供量化手段.

Sorption and desorption of polycyclic aromatic hydrocarbons in two typical Chinese soils

In this study, the sorption and desorption of naphthalene and phenanthrene were investigated in two representative Chinese soils using a batch approach. The desorption data were predicted using a new desorption model "Dual-Equilibrium Desorption (DED) model". The result indicated that the sorption of both naphthalene and phenanthrene agree well with the conventional linear sorption isotherm. The desorption experimental data showed significant desorption hysteresis but it could be predicted well with the DEDmodel. The DEDmodel requires only simple physical-chemical parameters but can describe the desorption of hydrophobic organic contaminants precisely. The DEDmodel could be used as a quantitative tool for soil risk assessment and for establishing soil quality standards.