Abstract
The present work investigates whether dielectric spectroscopy can be used to detect contamination, which may leach in a natural porous material, due to the spreading of contaminants. For this purpose, dielectric and conductivity measurements, in the frequency range from 10 mHz to 1 MHz, were carried out in sandstone samples, partially filled or saturated with solutions of leachates, at different concentrations. The experimental results suggest the dominant role of free water to the measured electrical conductivity and dielectric permittivity in contaminated samples with high water content. On the other hand, various relaxation mechanisms were observed in dried samples at different leachate concentrations. Experimental data were fitted using the Havriliak-Negami dielectric relaxation function, superimposed with a conductivity term. The determined parameters of the fitting function may serve to distinguish between different amounts of leachate in sandstone samples.
| Original language | English |
|---|---|
| Pages (from-to) | 520-525 |
| Number of pages | 6 |
| Journal | Journal of Hazardous Materials |
| Volume | 142 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - 2 Apr 2007 |
| Externally published | Yes |
Bibliographical note
Funding Information:This work is partially supported from the project Archimedes: “Support of Research Teams of Technological Educational Institutes”, sub-project entitled “The electric behaviour of geo-materials” in the framework of the Operational Program for Education and Initial Vocational Training. The project is co-funded by the European Social Fund and National Resources.
Keywords
- Contamination
- Dielectric spectroscopy
- Leachate
- Sandstone
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
- Health, Toxicology and Mutagenesis