Linking micro-aggregation to the sequestration of organic pollutants in soils

将微聚集与土壤中有机污染物的封存联系起来

• 批准号: 41017521
• 负责人: Professorin Dr. Friederike Lang
• 金额: --
• 依托单位: Professur für Bodenökologie
• 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 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/41017521?language=en
• 关键词: Linking; micro; aggregation; sequestration; organic

Physicochemical and steric properties of organic chemicals on the one hand and physicochemical surface properties and structural properties of the sorbent on the other hand determine sorptive interactions at biogeochemical interfaces. In order to gain a mechanistic understanding of these interactions we want to combine macroscopic, micro-calorimetric, and spectroscopic methods. We hypothesise that sorption and distribution of a polar organic chemical at biogeochemical interfaces is either determined by the molecules hydrophobic R-groups (R-determined) or its functional groups (F-determined). To test our hypothesis we will study sorption of bisphenol A and fenhexamid (R-determined chemicals), and bentazon and naproxen (F-determined chemicals) in pure systems of minerals (kaolinite, illite, gibbsite, and quartz), in model substances for biofilms (polygalacturonic acid and dextran), in combined systems of mineral phases with organic layers, and in topsoils and subsoils. Interpretation and modelling of sorption isotherms and sorption kinetics derived from batch experiments together with results from diffusion experiments with polysugars of variable crosslinking will provide macroscopic insight into sorptive interactions. Information regarding the thermodynamics of sorption will by derived from micro-calorimetry. Spectroscopic (ATR FTIR, NMR) measurements deliver information on molecular interactions and structure.

一方面有机化学品的物理化学和空间性质，另一方面吸附剂的物理化学表面性质和结构性质决定了生物化学界面的吸附相互作用。为了获得这些相互作用的机理的理解，我们希望结合联合收割机宏观，微量热，光谱方法。我们假设，吸附和分布的极性有机化学品在非地球化学界面是由分子的疏水性R-基团（R-决定）或其功能基团（F-决定）。为了验证我们的假设，我们将研究吸附双酚A和环酰菌胺（R-确定的化学品），苯达松和naplisen（F-确定的化学品）在纯系统的矿物（高岭石，伊利石，三水铝石，石英），在模型物质的生物膜（聚半乳糖醛酸和葡聚糖），在结合系统的矿物相与有机层，并在表土和底土。解释和建模的吸附等温线和吸附动力学来自批量实验，连同结果从扩散实验与多糖的可变交联将提供宏观洞察吸附相互作用。关于吸附热力学的信息将由微量热法得出。光谱（ATR FTIR，NMR）测量提供分子相互作用和结构的信息。