Effects of soil organic matter molecular conformation and substrate additions on the formation and release of xenobiotics bound residues

土壤有机质(SOM)对疏水性有机污染物(HOCs)的吸附性能可以通过用不同电荷的阳离子饱和交换中心来改变，因为这改变了有机基质的分子构象。与矿物的相互作用可以进一步影响SOM的构象和性质。这些相互作用被认为随着老化而增加，这里将测试它们是否也会影响HOC结合残留物的形成和它们的生物降解性。用土壤浸出物、土壤浆体和土壤样品对水合铁和蒙脱石进行批量吸附实验，以确定SOM对矿物的吸附。新形成的有机-矿物界面的特征在于它们对疏水化合物(菲)和极性化合物(MCPA)的吸附性能以及它们的物理化学性质(即接触角、玻璃化转变温度)，并与其他SPP申请者密切合作。这一阶段的主要重点将是建立一个联合计划的长期老化实验，其中将确定阳离子处理、矿物和生物活性对有机-矿物界面和菲结合残留物的形成和性质的相互作用。

The sorption properties of soil organic matter (SOM) for hydrophobic organic contaminants (HOCs) can be modified by saturating the exchange sites with differently charged cations because this alters the molecular conformation of the organic matrix. Interactions with minerals can further influence the conformation and properties of SOM. These interactions are assumed to increase with aging and it will here be tested if they will also affect the formation of HOC bound residues and their biodegradability. Batch sorption experiments of ferrihydrite and montmorillonite with soil extracts, soil slurries and soil samples will be carried out to determine sorption of SOM to the minerals. The newly formed organo-mineral interfaces are characterized in terms of their sorptive properties for a hydrophobic (phenanthrene) and a polar compound (MCPA) and their physico-chemical properties (i.e. contact angle, glass transition temperature) in close cooperation with other SPP applicants. The main focus of this phase will be to set up a jointly planned long-term aging experiment where the interactions of cation treatments, minerals and biological activity on the formation and properties of organo-mineral interfaces and phenanthrene bound residues will be determined.