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.

疏水有机污染物（HOC）土壤有机物（SOM）的吸附特性可以通过用带电不同的阳离子饱和的交换位点来修饰，因为这会改变有机基质的分子构象。与矿物质的相互作用可以进一步影响SOM的构象和特性。假定这些相互作用会随着衰老而增加，如果它们还会影响HOC结合残基的形成及其生物降解性，则将在这里进行测试。将进行批处理吸附实验，并用土壤提取物，土壤泥浆和土壤样品进行土壤提取物，以确定SOM对矿物质的吸附。新形成的有机矿物界面的特征是疏水性（菲）和极性化合物（MCPA）及其物理化学特性（即接触角，玻璃转变温度）与其他SPP申请人密切合作。该阶段的主要重点是建立一个共同计划的长期老化实验，其中将确定有机矿物接口的形成和性质的阳离处理，矿物质和生物学活性的相互作用以及将确定稳态的残基。