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Interactions of Heavy Metal Ions with Paddy Soils as Inferred from Wien Effect Measurements in Dilute Suspensions1 1 Project supported by the National Key Basic Research Support Foundation of China (No. 2002CB410808) and the National Natural Science Foundation of China (No. 40401030).
Year:
2006
Source of publication :
Pedosphere
Authors :
Friedman, Samuel
;
.
Volume :
16
Co-Authors:
JIANG, J., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
LI, C.-B., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
ZHAO, A.-Z., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
XU, R.-K., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
WANG, Y.-J., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
FRIEDMAN, S.P., Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, 50250, Israel
Facilitators :
From page:
718
To page:
725
(
Total pages:
8
)
Abstract:
Interactions of three heavy metal ions, Cu2+, Cd2+, and Pb2+, and, for comparison, Na+ with electrodialytic clay fractions (less than 2 μm in diameter) of four paddy soils as well as a yellow-brown soil as a control soil were evaluated based on measurements of the Wien effect in dilute suspensions with a clay concentration of 10 g kg-1 in four nitrate solutions of 2 × 10-4/z mol L-1, where z is the cation valence, and a nitric acid solution of 3 × 10-5 mol L-1. Field strengths ranging from 15 to 230 kV cm-1 were applied for measuring the electrical conductivities (ECs) of the suspensions. The mean free binding energies between the various cations and all of the soils determined from exchange equilibrium increased in the order: Na+ < Cd2+ < Cu2+ < Pb2+. In general, the ECs of the suspensions in the sodium nitrate solution were smaller than those of the suspensions in the heavy metal solutions because of the lower electrophoretic mobility of sodium compared to the divalent cations. In terms of relative electrical conductivity-field strength relationships, relative electrical conductivity (REC) of suspensions containing various cations at field strengths larger than about 50 kV cm-1 were in the descending order: Na+ > Cu2+ > Cd2+ > Pb2+ for all tested soils. A characteristic parameter of the REC-field strength curves, ΔREC200, REC at a field strength of 200 kV cm-1 minus that at the local minimum of the concave segment of the REC-field strength curves, characterized the strength of adsorption of the cations stripped off by the applied strong electrical field, and for all soils the values of ΔREC200 were generally in the order: Na+ < Cu2+ ≤ Cd2+ ≤ Pb2+. © 2006 Soil Science Society of China.
Note:
Related Files :
Binding energy
brown soil
Clay
Electrical conductivity
field strength
heavy metal
heavy metal ions
ion exchange
paddy soils
Show More
Related Content
More details
DOI :
10.1016/S1002-0160(06)60107-0
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
32232
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:08
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Scientific Publication
Interactions of Heavy Metal Ions with Paddy Soils as Inferred from Wien Effect Measurements in Dilute Suspensions1 1 Project supported by the National Key Basic Research Support Foundation of China (No. 2002CB410808) and the National Natural Science Foundation of China (No. 40401030).
16
JIANG, J., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
LI, C.-B., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
ZHAO, A.-Z., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
XU, R.-K., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
WANG, Y.-J., Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
FRIEDMAN, S.P., Institute of Soil, Water, and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, 50250, Israel
Interactions of Heavy Metal Ions with Paddy Soils as Inferred from Wien Effect Measurements in Dilute Suspensions1 1 Project supported by the National Key Basic Research Support Foundation of China (No. 2002CB410808) and the National Natural Science Foundation of China (No. 40401030).
Interactions of three heavy metal ions, Cu2+, Cd2+, and Pb2+, and, for comparison, Na+ with electrodialytic clay fractions (less than 2 μm in diameter) of four paddy soils as well as a yellow-brown soil as a control soil were evaluated based on measurements of the Wien effect in dilute suspensions with a clay concentration of 10 g kg-1 in four nitrate solutions of 2 × 10-4/z mol L-1, where z is the cation valence, and a nitric acid solution of 3 × 10-5 mol L-1. Field strengths ranging from 15 to 230 kV cm-1 were applied for measuring the electrical conductivities (ECs) of the suspensions. The mean free binding energies between the various cations and all of the soils determined from exchange equilibrium increased in the order: Na+ < Cd2+ < Cu2+ < Pb2+. In general, the ECs of the suspensions in the sodium nitrate solution were smaller than those of the suspensions in the heavy metal solutions because of the lower electrophoretic mobility of sodium compared to the divalent cations. In terms of relative electrical conductivity-field strength relationships, relative electrical conductivity (REC) of suspensions containing various cations at field strengths larger than about 50 kV cm-1 were in the descending order: Na+ > Cu2+ > Cd2+ > Pb2+ for all tested soils. A characteristic parameter of the REC-field strength curves, ΔREC200, REC at a field strength of 200 kV cm-1 minus that at the local minimum of the concave segment of the REC-field strength curves, characterized the strength of adsorption of the cations stripped off by the applied strong electrical field, and for all soils the values of ΔREC200 were generally in the order: Na+ < Cu2+ ≤ Cd2+ ≤ Pb2+. © 2006 Soil Science Society of China.
Scientific Publication
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