多环芳烃类有机物在腐殖酸上的吸附行为研究

Sorption behavior of polycyclic aromatic hydrocarbons onto humic acid particulates

利用CPMAS13CNMR与元素分析相结合的方法测定了3种固体腐殖酸颗粒的化学组成,利用1H-NMR测定了3种腐殖酸溶解部分的化学性质,研究了不同接触时间3种腐殖酸颗粒吸附3种典型多环芳烃类有机物(PAHs)——萘、菲、芘的环境行为.实验结果发现,在吸附的不同阶段,3种腐殖酸吸附PAHs的规律和模式有很大差别:开始阶段,分配作用可能是吸附的主要模式,吸附参数与腐殖酸溶解部分化学性质有一定的相关性;随着接触时间的延长,吸附参数发生突跃性变化,意味着吸附模式发生了转变,此时固体腐殖酸化学组成可能是影响吸附的主要因素.

The chemical compositions of three solid humic acid（HA）samples were measured using cross polarization magic angle spinning carbon-13（CPMAS 13C）NMR along with elemental analysis,and the humic acids dissociating from the three HA samples were characterized by 1H NMR.The time-dependent sorption behavior of three model polycyclic aromatic hydrocarbons（PAHs）,naphthalene,phenanthrene and pyrene,from water onto the three HA samples was determined.The experiments show that the properties and the modes of PAH sorption onto three HAs vastly differ in various sorption stages.At the beginning of sorption,partition maybe the major mode and the sorption coefficients are correlated to the chemical characteristics of the dissolved HAs.Over time,a sharp change of sorption coefficients occurs,indicating a conversion of sorption mode and the uptake parameters probably depend on the chemical composition of the solid HAs.