Institute of Physical and Theoretical Chemistry, University of Tuebingen, Auf der Morgenstelle 18, 72076, Tuebingen, Germany.
Anal Bioanal Chem. 2009 Nov;395(6):1867-76. doi: 10.1007/s00216-009-2978-3. Epub 2009 Aug 4.
This paper presents an optical approach, based on the use of a low-cost charge-coupled device (CCD) camera, for the quantitative determination of solute concentrations in saturated porous media. The method is applied to evaluate tracer experiments carried out in a laboratory model tank. The CCD photos deliver RGB values which are transferred into concentrations for the evaluation of vertical concentration profiles over the whole tank area. A specially developed evaluation procedure, including internal referencing for noise reduction, considers the colour of the adjacencies of the evaluated spots and scattering effects. The CCD data evaluation technique is accompanied by conventional sampling and absorption measurements and by numerical flow and transport simulations. This non-invasive technique allows a direct mapping of the concentration distribution without any disturbance of the solute plume. Therefore, it turns out to be an important tool for a detailed investigation of fundamental processes (e.g. transverse dispersion) determining the solute (e.g. contaminant) transport in porous media.
本文提出了一种基于使用低成本电荷耦合器件（CCD）相机的光学方法，用于定量测定饱和多孔介质中的溶质浓度。该方法应用于评估在实验室模型罐中进行的示踪实验。CCD 照片提供 RGB 值，这些值被转换为浓度，以评估整个罐区的垂直浓度分布。专门开发的评估程序包括内部参考以降低噪声，并考虑到评估点的相邻颜色和散射效应。CCD 数据评估技术伴随着常规采样和吸收测量以及数值流动和传输模拟。这种非侵入性技术允许在不干扰溶质羽流的情况下直接绘制浓度分布。因此，它成为研究决定多孔介质中溶质（例如污染物）传输的基本过程（例如横向弥散）的重要工具。
