Mei Yi, Wu Fengchang, Wang Liying, Bai Yingchen, Li Wen, Liao Haiqing
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China.
J Environ Sci (China). 2009;21(4):414-23. doi: 10.1016/s1001-0742(08)62285-8.
Six hydrophobic and hydrophilic fractions were isolated using XAD-8 and XAD-4 resins, and were extensively characterized. Partition coefficients of perylene, phenanthrene and anthracene binding to the six fractions were determined by fluorescence quenching titration. The Kdoc values obtained for the polycyclic aromatic hydrocarbons (PAHs) binding to the hydrophobic fractions were larger than those to the hydrophilic fractions. Nonlinear Stern-Volmer plots were observed when binding phenanthrene and anthracene to some hydrophilic fraction samples, suggesting saturation of polar interaction binding sites. A significant correlation of logKdoc values with molecular weights and molar absorptivities at 280 nm was observed, while atomic ratio of C/H was found to be a poor indicator for aromaticity. Other structural descriptors such as paraffinic carbon and polarity influenced the DOM-fraction ability to bind PAHs. Different interaction mechanisms underlying binding of the different fractions to the PAHs were also discussed.
使用XAD - 8和XAD - 4树脂分离出六个疏水和亲水组分，并对其进行了广泛表征。通过荧光猝灭滴定法测定了苝、菲和蒽与这六个组分结合的分配系数。多环芳烃（PAHs）与疏水组分结合获得的Kdoc值大于与亲水组分结合的Kdoc值。当菲和蒽与一些亲水组分样品结合时，观察到非线性斯特恩 - 沃尔默图，表明极性相互作用结合位点饱和。观察到logKdoc值与分子量和280 nm处的摩尔吸光率之间存在显著相关性，而碳/氢原子比被发现是芳香性的一个较差指标。其他结构描述符，如链烷碳和极性，影响了DOM组分与PAHs结合的能力。还讨论了不同组分与PAHs结合背后的不同相互作用机制。
