Organic molecules as sorbing tracers for the assessment of surface areas in consolidated aquifer systems
Organic molecules as sorbing tracers for the assessment of surface areas in consolidated aquifer systems
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DOI：
10.1016/j.jhydrol.2017.01.013
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发表时间：
2017-03
影响因子：
6.4
通讯作者：
M. Schaffer;Wiebke Warner;Susann Kutzner;H. Börnick;E. Worch;T. Licha
中科院分区：
文献类型：
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作者：
M. Schaffer;Wiebke Warner;Susann Kutzner;H. Börnick;E. Worch;T. Licha
基于固结岩石材料的比表面积与体积比Asurf/V与可用于吸附的表面积成比例的假设，最近提出了几种无机阳离子作为吸附（阳离子交换）示踪剂，用于估计含水层中的这些比率（例如，用于导出地热储层的有效热交换面积）。然而，无机离子的主要缺点是合适离子的数量有限，它们潜在的地质背景，以及它们在痕量浓度下具有挑战性的在线检测。在这项工作中，光谱的化学物质作为吸附示踪剂扩大考虑荧光有机化合物是阳离子。它们具有高度水溶性的优点，并且易于在非常低的浓度下在线测量。从系统的实验室柱实验与七个选定的有机阳离子在各种条件下（不同的盐度和温度）的结果，强调潜在的有机分子作为替代吸附示踪剂，特别是在巩固含水层系统。这项工作是确定合适的分子结构的第一块垫脚石，这些分子结构可以选择，甚至可以单独适应示踪剂试验和主要含水层条件的要求。
Based on the assumption that the specific surface area to volume ratioAsurf/Vof consolidated rock materials is proportional to the surface area available for sorption, several inorganic cations were recently proposed as sorbing (cation exchanging) tracers for estimating these ratios in aquifers (e.g., for deriving the efficient heat exchange area of geothermal reservoirs). The main disadvantages of inorganic ions, however, are the limited number of suitable ions, their potential geogenic background, and their challenging online detection at trace concentrations. In this work, the spectrum of chemical substances used as sorbing tracers expands by considering fluorescent organic compounds that are cationic. They have the advantage of being highly water soluble and easy to measure online at very low concentrations. Results from systematic lab column experiments with seven selected organic cations under various conditions (different salinities and temperatures) are presented, emphasizing the potential of organic molecules as alternative sorbing tracers especially in consolidated aquifer systems. This work is a first stepping stone in identifying suitable molecular structures that can be selected or even individually adapted to the requirements of the tracer tests and prevailing aquifer conditions.