Investigation of pore scale processes at biogeochemical interfaces using sensor micromodels and Raman microscopy

使用传感器微模型和拉曼显微镜研究生物地球化学界面的孔隙尺度过程

• 批准号: 40976435
• 负责人: Professor Dr. Thomas Baumann
• 金额: --
• 依托单位: Lehrstuhl für Analytische Chemie und Wasserchemie
• 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 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/40976435?language=en
• 关键词: Investigation; pore; scale; processes; biogeochemical

Biogeochemical interfaces (BGI) in soil control the fate of organic chemicals and the functioning of soil as a filter to protect groundwater resources. To understand and quantify the processes at BGI, the concentration gradients of organic chemicals have to be measured and the spatial and temporal dynamics of the BGI themselves have to be monitored. Microfluidic systems with the pore structure of soils (micromodels), allow the visualize the spatial development of BGI in a flow through system under varying environmental conditions with single interface resolution. This project extends the micromodel technique with a chemically sensitive sensor layer and with Raman microscopy to measure the concentration of hexadecane and phenanthrene, possible degradation products and changes of the BGI with high spatial and temporal resolution (<2 μm, <1 s). The measurements are non-destructive and do not require tracers in the fluid flow. The time series data of the spatial features and concentration gradients at BGI is a keystone for quantification of the processes at BGI and provides a link between projects on the molecular level (AFM), pore scale visualizations (CLSM, μCT) and projects on the dm-scale.

土壤中的生物地球化学界面（BGI）控制着有机化学物质的命运和土壤作为保护地下水资源的过滤器的功能。为了理解和量化BGI的过程，必须测量有机化学品的浓度梯度，并监测BGI本身的空间和时间动态。具有土壤孔隙结构的微流体系统（微模型）允许在不同环境条件下以单一界面分辨率可视化BGI在流通系统中的空间发展。该项目利用化学敏感传感器层和拉曼显微镜扩展了微模型技术，以高空间和时间分辨率（<2 μm，<1 s）测量十六烷和菲的浓度、可能的降解产物和BGI的变化。测量是非破坏性的，并且不需要流体流中的示踪剂。BGI的空间特征和浓度梯度的时间序列数据是BGI过程量化的关键，并提供了分子水平项目（AFM），孔尺度可视化（CLSM，μCT）和dm尺度项目之间的联系。