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

土壤有机质分子构象和底物添加对外源物质结合残留物形成和释放的影响

• 批准号: 40956920
• 负责人: Professor Dr. Bernd Marschner
• 金额: --
• 依托单位: Geographisches Institut
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/40956920?language=en
• 关键词: Effects; soil; organic; matter; molecular

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.

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位点来改变，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。假设这些相互作用随着老化而增加，并且将在此测试它们是否也会影响HOC结合残留物的形成及其生物降解性。采用土壤浸提液、土壤泥浆和土壤样品对水铁矿和蒙脱石进行批量吸附实验，以确定有机质对矿物的吸附。新形成的有机-无机界面的特征在于其吸附性能的疏水性（菲）和极性化合物（MCPA）和他们的物理化学性质（即接触角，玻璃化转变温度）与其他SPP申请人密切合作。这一阶段的主要重点将是建立一个共同计划的长期老化实验，其中阳离子处理，矿物质和生物活性对有机-矿物界面和菲结合残留物的形成和性质的相互作用将被确定。