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פותח על ידי קלירמאש פתרונות בע"מ -
Capacities of clay fraction of a latosol to retain cations and anions as inferred from the Wien effect in soil suspensions
Year:
2003
Source of publication :
Pedosphere
Authors :
פרידמן, שמואל
;
.
Volume :
13
Co-Authors:
Li, C., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Friedman, S.P., Inst. of Soil, Water/Environ. Sci., 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:
165
To page:
172
(
Total pages:
8
)
Abstract:
Suspensions of a latosol with a clay concentration of 30 g kg-1 were prepared from electrodialyzed clay fractions, less than 2 μm in diameter, five nitrate solutions with a concentration of 1 × 10 -4/z mol L-1, where z is the valence, and five sodium salt solutions with a concentration of 3.3 × 10-5/z mol L -1. The direct current (DC) electrical conductivities (ECs) of the colloidal suspensions were measured at a constant temperature of 25°C, using a newly established method of measuring the Wien effect in soil suspensions at field strengths ranging from 13.5 to 150 kV cm-1, to determine their electrical conductivity-field strength relationships and to infer the order of the bonding strength (retaining force) between soil particles and various ions. The measurements with the latosol suspensions in NaNO3, KNO3, Ca(NO3)2, Mg(NO 3)2 and Zn(NO3)2 solutions resulted in increments of the suspension ECs, ΔECs, of 7.9, 5.0, 7.1, 7.0 and 5.8 μS cm-1, respectively, when the applied field strength increased from 14.5 to 142 kV cm-1. As for the suspensions in NaNO 3, NaCl, Na2SO4, Na3PO4 and Na3AsO4 solutions, the ΔECs were 6.2, 5.3, 4.1, 4.0 and 3.7 μS cm-1, respectively, when the applied field strength increased from 13.5 to 90 kV cm-1. Thus, it can be deduced that the retaining forces of the clay fraction of the latosol for the cations were in the descending order K+ > Zn2+ > Mg 2+ ≥ Ca2+ > Na+, and for the anions in the descending order H2AsO4- > H 2PO4- ≥ SO42- > Cl- > NO3-.
Note:
Related Files :
Bonding strength
Capacity of retaining ions
clay mineral
colloid
ion exchange
Latosol
Wien effect in suspensions
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
23730
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:02
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Scientific Publication
Capacities of clay fraction of a latosol to retain cations and anions as inferred from the Wien effect in soil suspensions
13
Li, C., Institute of Soil Science, Chinese Academy of Sciences, P.O. Box 821, Nanjing 210008, China
Friedman, S.P., Inst. of Soil, Water/Environ. Sci., 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
Capacities of clay fraction of a latosol to retain cations and anions as inferred from the Wien effect in soil suspensions
Suspensions of a latosol with a clay concentration of 30 g kg-1 were prepared from electrodialyzed clay fractions, less than 2 μm in diameter, five nitrate solutions with a concentration of 1 × 10 -4/z mol L-1, where z is the valence, and five sodium salt solutions with a concentration of 3.3 × 10-5/z mol L -1. The direct current (DC) electrical conductivities (ECs) of the colloidal suspensions were measured at a constant temperature of 25°C, using a newly established method of measuring the Wien effect in soil suspensions at field strengths ranging from 13.5 to 150 kV cm-1, to determine their electrical conductivity-field strength relationships and to infer the order of the bonding strength (retaining force) between soil particles and various ions. The measurements with the latosol suspensions in NaNO3, KNO3, Ca(NO3)2, Mg(NO 3)2 and Zn(NO3)2 solutions resulted in increments of the suspension ECs, ΔECs, of 7.9, 5.0, 7.1, 7.0 and 5.8 μS cm-1, respectively, when the applied field strength increased from 14.5 to 142 kV cm-1. As for the suspensions in NaNO 3, NaCl, Na2SO4, Na3PO4 and Na3AsO4 solutions, the ΔECs were 6.2, 5.3, 4.1, 4.0 and 3.7 μS cm-1, respectively, when the applied field strength increased from 13.5 to 90 kV cm-1. Thus, it can be deduced that the retaining forces of the clay fraction of the latosol for the cations were in the descending order K+ > Zn2+ > Mg 2+ ≥ Ca2+ > Na+, and for the anions in the descending order H2AsO4- > H 2PO4- ≥ SO42- > Cl- > NO3-.
Scientific Publication
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