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Wien effect in suspensions of electrodialyzed soil particles and its influencing factors
Year:
2002
Source of publication :
Pedosphere
Authors :
Friedman, Samuel
;
.
Volume :
12
Co-Authors:
Li, C., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Friedamn, S.P., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zhao, A., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Facilitators :
From page:
235
To page:
242
(
Total pages:
8
)
Abstract:
The electrical conductivity of suspensions and their supernatants from the electrodialyzed clay fractions of latosol, yellow-brown soil and black soil equilibrated with nitrate solutions were determined at different field strengths using a short high-voltage pulse apparatus to demonstrate the Wien effect in soil suspensions and to investigate factors affecting it. It was found that Wien effect was much stronger in suspensions with a clay content of 30 g kg -1 from the soils equilibrated with a 1 × 10-4 KNO3 solution than in their supernatants. The threshold field strength (TFS), at which the relative conductivity is equal to 1.05, i.e., the Wien effect begins to be obvious, of the yellow-brown soil suspensions (clay content of 30 g kg-1) equilibrated with different nitrate solutions of a concentration of 1 × 10-4/z mol L-1, where z is the valence, varied with the type of nitrates, being lowest for NaNO 3 (47 kV cm-1) and highest for Ca(NO3) 2 (98 kV cm-1). At high field strengths (larger than 130 kV cm-1), the relative conductivities of yellow-brown soil suspensions containing different nitrates diminished in the order: NaNO 3 > KNO3 > Mg(NO3)2 > Zn(NO3)2 > Ca(NO3)2. The rates and intensities of the Wien effect in the suspensions of the three soils equilibrated with 5 × 10-5 mol L-1 Ca(NO 3)2 solution were in the order of the yellow-brown soil > the latosol > the black soil. The results for the yellow-brown soil suspensions (clay concentration of 30 g kg-1) equilibrated with KNO3 solutions of various concentrations clearly demonstrated that the more dilute the solution, the lower the TFS, and the larger the relative conductivity of the suspensions at high field strengths. The results for yellow-brown soil suspensions with different clay concentrations indicated that as the clay concentration increased, the low field electrical conductivity, EC0, also increased, but the TFS decreased, and the Wien effect increased. © 2002 Science Press.
Note:
Related Files :
Clay
Electrical conductivity
High field strength
nitrate
Soil suspension
soil type
Wien effect
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More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
31470
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:02
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Scientific Publication
Wien effect in suspensions of electrodialyzed soil particles and its influencing factors
12
Li, C., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Friedamn, S.P., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Zhao, A., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Wien effect in suspensions of electrodialyzed soil particles and its influencing factors
The electrical conductivity of suspensions and their supernatants from the electrodialyzed clay fractions of latosol, yellow-brown soil and black soil equilibrated with nitrate solutions were determined at different field strengths using a short high-voltage pulse apparatus to demonstrate the Wien effect in soil suspensions and to investigate factors affecting it. It was found that Wien effect was much stronger in suspensions with a clay content of 30 g kg -1 from the soils equilibrated with a 1 × 10-4 KNO3 solution than in their supernatants. The threshold field strength (TFS), at which the relative conductivity is equal to 1.05, i.e., the Wien effect begins to be obvious, of the yellow-brown soil suspensions (clay content of 30 g kg-1) equilibrated with different nitrate solutions of a concentration of 1 × 10-4/z mol L-1, where z is the valence, varied with the type of nitrates, being lowest for NaNO 3 (47 kV cm-1) and highest for Ca(NO3) 2 (98 kV cm-1). At high field strengths (larger than 130 kV cm-1), the relative conductivities of yellow-brown soil suspensions containing different nitrates diminished in the order: NaNO 3 > KNO3 > Mg(NO3)2 > Zn(NO3)2 > Ca(NO3)2. The rates and intensities of the Wien effect in the suspensions of the three soils equilibrated with 5 × 10-5 mol L-1 Ca(NO 3)2 solution were in the order of the yellow-brown soil > the latosol > the black soil. The results for the yellow-brown soil suspensions (clay concentration of 30 g kg-1) equilibrated with KNO3 solutions of various concentrations clearly demonstrated that the more dilute the solution, the lower the TFS, and the larger the relative conductivity of the suspensions at high field strengths. The results for yellow-brown soil suspensions with different clay concentrations indicated that as the clay concentration increased, the low field electrical conductivity, EC0, also increased, but the TFS decreased, and the Wien effect increased. © 2002 Science Press.
Scientific Publication
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