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Sensors 2016, 16(5), 625; doi:10.3390/s16050625

In Situ Representation of Soil/Sediment Conductivity Using Electrochemical Impedance Spectroscopy

1
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
2
MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Russell Binions
Received: 14 February 2016 / Revised: 26 March 2016 / Accepted: 9 April 2016 / Published: 30 April 2016
(This article belongs to the Special Issue Sensors for Environmental Monitoring 2016)
View Full-Text   |   Download PDF [1265 KB, uploaded 30 April 2016]   |  

Abstract

The electrical conductivity (EC) of soil is generally measured after soil extraction, so this method cannot represent the in situ EC of soil (e.g., EC of soils with different moisture contents) and therefore lacks comparability in some cases. Using a resistance measurement apparatus converted from a configuration of soil microbial fuel cell, the in situ soil EC was evaluated according to the Ohmic resistance (Rs) measured using electrochemical impedance spectroscopy. The EC of soils with moisture content from 9.1% to 37.5% was calculated according to Rs. A significant positive correlation (R2 = 0.896, p < 0.01) between the soil EC and the moisture content was observed, which demonstrated the feasibility of the approach. This new method can not only represent the actual soil EC, but also does not need any pretreatment. Thus it may be used widely in the measurement of the EC for soils and sediments. View Full-Text
Keywords: soil microbial fuel cells; soil electrical conductivity; electrochemical impedance spectroscopy; soil resistivity; resistance measurement apparatus soil microbial fuel cells; soil electrical conductivity; electrochemical impedance spectroscopy; soil resistivity; resistance measurement apparatus
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, X.; Wang, X.; Zhao, Q.; Zhang, Y.; Zhou, Q. In Situ Representation of Soil/Sediment Conductivity Using Electrochemical Impedance Spectroscopy. Sensors 2016, 16, 625.

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