【摘要】 利用超声分散法提取了黑龙江大庆黑钙土中不同粒级有机-矿质复合体,并测定了其基本理化性质.其中粘粒复合体的有机质含量最高,比表面积以及阳离子交换容量最大.研究了多环芳烃菲在不同粒级有机-矿质复合体上的吸附和解吸行为.结果表明,菲在各粒级有机-矿质复合体上的吸附和解吸等温线均符合Freundlich方程,随粒径减小,有机-矿质复合体对菲的吸附容量以及吸附的非线性程度都增加.菲在有机-矿质复合体上的解吸表现出明显的滞后现象.高有机质含量的粘粒有机-矿质复合体对菲的吸附和持留能力均较强.更多还原

【Abstract】 Organo-mineral aggregates in various fractions were isolated from chernozem in Daqing City,Heilongiang by ultrasonic dispersion in water followed by sedimentation.The physicochemical properties of the different particle-size fractions were determined.It was found that clay fraction had the highest soil organic matter(SOM) content,the largest surface area and the greatest cation exchange capacity.The adsorption and desorption behaviour of polycyclic aromatic hydrocarbons on different fractions was investigated using phenanthrene as model substrate. The adsorption and desorption isotherms in all fractions were well described by the Freundlich equation and demonstrated the increase in the adsorption capacity and nonlinearity with the decrease of particle size.Apparent hysteresis existed in phenanthrene desorption from organo-mineral aggregates.The adsorption capacity was significantly dependent on SOM content,and the clay fraction with high SOM had high capacity of sorption and resistant desorption.更多还原