کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
584584 1453184 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric and conductivity measurements as proxy method to monitor contamination in sandstone
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بهداشت و امنیت شیمی
پیش نمایش صفحه اول مقاله
Dielectric and conductivity measurements as proxy method to monitor contamination in sandstone
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 142, Issues 1–2, 2 April 2007, Pages 520-525
نویسندگان
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