Imaging and image simulation of organic target compound migration between different biogeochemical interfaces of a soil horizon using positron emission tomography and the lattice Boltzmann equation approach

使用正电子发射断层扫描和格子玻尔兹曼方程方法对土壤层不同生物地球化学界面之间的有机目标化合物迁移进行成像和图像模拟

• 批准号: 183483479
• 负责人: Professor Dr.-Ing. Michael Kersten
• 金额: --
• 依托单位: Arbeitsgruppe Hydrogeochemie
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/183483479?language=en
• 关键词: Imaging; image; simulation; organic; target

We propose to use positron emission tomography (PET) for imaging of tracer migration in a soil horizon, to be coupled with image simulation using the lattice Boltzmann equation (LBE) modeling approach. PET enables direct visualization of inert KF or KBr solute migration at the soil horizon scale, but also reactive halogenated organic target (2,4-D and MCPA) compound migration down to nM concentrations once radiolabelling with 18F or 76Br marker is achieved. Retardation at biogeochemical interfaces with different sorption properties will thus be imaged in-situ. Theoretical image simulation for process verification will be enabled by introducing a multi-grid approach and additional kinetic boundary conditions in the parallelized LBE solver. As a boundary condition for the latter, the real pore scale and distribution of biogeochemical interfaces will be derived by X-ray computer-tomography (XCT) down to 300 nm spatial voxel resolution. The aim is to produce by both approaches velocity field movies due to heterogeneous biogeochemical retardation of the target compounds with high resolution in both the spatial and temporal scale (4D).

我们建议使用正电子发射断层扫描（PET）的示踪剂迁移在土壤层的成像，再加上图像模拟使用晶格玻尔兹曼方程（LBE）建模方法。PET能够直接观察土壤层位尺度上的惰性KF或KBr溶质迁移，而且一旦实现18F或76 Br标记物的放射性标记，反应性卤代有机目标（2，4-D和MCPA）化合物的迁移也可降至nM浓度。因此，具有不同吸附性质的地球化学界面处的延迟将原位成像。通过在并行LBE求解器中引入多重网格方法和附加动力学边界条件，将实现用于工艺验证的理论图像模拟。作为后者的边界条件，将通过X射线计算机断层扫描（XCT）推导出低至300 nm空间体素分辨率的地球化学界面的真实的孔隙尺度和分布。目的是通过这两种方法产生由于目标化合物的非均质生物化学阻滞而在空间和时间尺度（4D）上具有高分辨率的速度场电影。