Dielectric Spectroscopy Analysis of Air-Dried Soils from Plovdiv District, Bulgaria | Приложение на диелектричната спектроскопия за анализ на въздушно изсушени почви
2013
Dospatliev, L., Thracian University, Stara Zagora (Bulgaria) | Ivanov, I., Thracian University, Stara Zagora (Bulgaria) | Parvanova, B., Thracian University, Stara Zagora (Bulgaria) | Katrandzhiev, N., University of Food Technologies, Plovdiv (Bulgaria) | Valkova, P., Thracian University, Stara Zagora (Bulgaria)
Measurements of the electric conductivity, ¦Т, and relative dielectric permittivity, ¦Еr, were conducted 0.1 Hz ЁC 15 MHz on 40 air-dried soil probes that were subsequently analyzed for pH, iron and heavy metal concentrations and organic matter. The pH of soil probes varied between pH 5.25 and pH 7.73 mean pH 6.70, the humus content varied between 1.07% and 2.46% mean 1.82%. The mean content of Fe was 3.4%, which was 87 fold higher than the mean concentration of the heavy metals Pb, Cd, Cr, Ni, Cu §Ъ Zn. We found a moderate linear relation between ¦Т 1 MHz and the indicated physicochemical parameters; pH coefficient of correlation, r = 0.58, iron concentration r = 0.44, content of humus r = 0.37 and heavy metal concentration r = 0.53. Similar relationships and correlation coefficients were found between ¦Еr 10 kHz and the same physicochemical parameters. As the latter represent general biogeochemical parameters, our findings suggest that dielectric spectroscopy may provide useful approach in probing soil geochemistry and iron cycling. Furthermore, our results yield insights into the impact of various physicochemical parameters on the induced polarization of soils.
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