Spatial and temporal observations of adsorption and remobilization of heavy metal ions in a sandy aquifer matrix using Magnetic Resonance Imaging.
Spatial and temporal observations of adsorption and remobilization of heavy metal ions in a sandy aquifer matrix using Magnetic Resonance Imaging.
复制标题
使用磁共振成像对砂质含水层基质中重金属离子的吸附和再活化进行时空观察。
DOI：
10.1021/es026250s
复制
发表时间：
2003
影响因子：
11.4
通讯作者：
T. Baumann
中科院分区：
文献类型：
--
作者：
N. Nestle;A. Wunderlich;R. Niessner;T. Baumann
自然条件下重金属离子在地下环境中的迁移和基质相互作用是环境科学与技术的重要研究领域。最常见的是，柱测试用于运输行为的第一次评估。经典的列测试在空间和时间分辨率方面不足;然而，这些详细的数据是适当放大所需要的。因此，提供空间和时间分辨的重金属离子在水湿含水层基质中的环境相关浓度的分布数据构成了分析化学的一个重大挑战。在这方面的贡献，我们提出的结果磁共振成像（MRI）的研究中，亚毫克量的重金属离子，无论是美联储conventially通过柱或局部注入饱和砂填料。随后的运输和动员进行了监测，在一个高的空间和时间分辨率。局部注射的结果表明，柱试验的试验设计尚未结束，MRI控制下的柱试验可用作模型系统，例如，补救技术。
The exploration of the transport and matrix interactions of heavy metal ions in the subsurface environment under natural conditions is an important field of research in environmental science and technology. Most commonly, column tests are used for a first assessment of the transport behavior. Classical column tests fall short with regard to the spatial and temporal resolution; however, these detailed data are needed for proper upscaling. Hence, providing spatially and temporally resolved data on the distribution of environmentally relevant concentrations of heavy metal ions in a water-wet aquifer matrix poses a major challenge to analytical chemistry. In this contribution, we present the results of Magnetic Resonance Imaging (MRI) studies in which submilligram quantities of heavy metal ions where either fed conventially through the column or locally injected into saturated sand packings. The subsequent transport and mobilization was monitored at a high spatial and temporal resolution. The results from a local injection show that the test design of column tests has not yet come to an end and that column tests under MRI-control may be used as a model system for, e.g., remediation techniques.