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首页> 外文会议>2010 International Conference on Mechanic Automation and Control Engineering >The role of dissolved organic matter in sorption process of polycyclic aromatic hydrocarbons on soils and sediments
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The role of dissolved organic matter in sorption process of polycyclic aromatic hydrocarbons on soils and sediments

机译：溶解有机物在土壤和沉积物中多环芳烃吸附过程中的作用

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The sorption behavior was determined for three model polycyclic aromatic hydrocarbons (PAHs), i.e., naphthalene (NAP), phenanthrene (PHN) and pyrene (PYR), from water to six soil and sediment samples. The humic substances dissociating from soils and sediments were characterized by liquid-state 1H NMR. The experiments show that the sorption of PAHs on soils and sediments is bimodal. In initial stage, the properties of dissolved humics are more important for as compared with solid particles. The soils or sediments present larger DOC content produce the stronger sorption capacities for three PAH molecules except for sediment III. The relatively lower Kf' values for sediment III possibly result from its less hydrophobic index of dissolved organic matter. With the increase of contacting time, the physicochemical properties of soils or sediment play more significent role. The larger SSA and smaller particle size produce stronger sorption capacities. These findings suggest that the dissolved organic matter is a nonnegligible consideration in studying PAH sorption process and only taking into account the solid humic characteristics cannot fully understand the whole sorption mechanism.
机译：确定了三种模型多环芳烃（PAHs）的吸附行为，即萘（NAP），菲（PHN）和pyr（PYR），从水到六个土壤和沉积物样品。用液态 1 1 H NMR表征从土壤和沉积物中分离出来的腐殖质。实验表明，PAHs在土壤和沉积物上的吸附是双峰的。在初始阶段，与固态颗粒相比，溶解腐殖质的特性更为重要。 DOC含量较高的土壤或沉积物对沉积物III以外的三个PAH分子产生更强的吸附能力。沉积物III相对较低的K f '值可能是由于其溶解有机物的疏水性指数较低所致。随着接触时间的增加，土壤或沉积物的理化性质起着更为重要的作用。较大的SSA和较小的粒度会产生较强的吸附能力。这些发现表明，在研究PAH吸附过程中，溶解的有机物是不可忽略的考虑因素，仅考虑到固体腐殖质特性就不能完全理解整个吸附机理。

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