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以自然土壤和过氧化氢分级土壤为实验模拟样品,测定了菲在这些样品上的吸附-解吸等温线,用线性和Freundlich模型拟合了这些等温线.13CNMR谱表明,随着土壤有机质腐殖化程度的加深,有机质将含有较多的长链烷烃化合物,含氧、氮化合物有所减少,芳香环的数量变化不大.吸附实验结果表明,土壤有机质含量与菲的吸附容量存在一定的线性相关关系.有机质腐殖质化程度较深的样品比原土壤具有更大的吸附容量,其吸附等温线表现出更为明显的非线性,而且具有更明显的解吸滞后现象.说明土壤中一些结构紧密和含极性官能团较少的有机质是引起菲的非线性吸附过程和解吸滞后现象的主要原因.
The adsorption and desorption isotherms of phenanthrene on these samples were measured using natural soils and hydrogen peroxide grading soils, and the isotherms were fitted by the linear and Freundlich models.13 The 13C NMR spectra show that with the soil organic matter humus The organic matter will contain more long-chain alkane compounds, oxygen and nitrogen compounds will decrease, while the number of aromatic rings will not change much.The results of adsorption experiments show that there is a certain linearity between the organic matter content of soil and the adsorption capacity of phenanthrene , The samples with deeper organic matter humus have more adsorption capacity than the original soil, and the adsorption isotherms show more obvious nonlinearity, and have more obvious desorption and lag phenomena.This shows that some structures in the soil are compact and Organic matter containing less polar functional groups is the main reason for the non-linear adsorption process of phenanthrene and the desorption lag phenomenon.