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Selenium desorption from Ca-Kaolinite
Year:
1987
Authors :
Bar-Yosef, Bnayahu
;
.
Volume :
18
Co-Authors:
Bar-Yosef, B., Water Management Research Laboratory, USDA-ARS, 2021 South Peach Av., Fresno, CA 93727, United States
Facilitators :
From page:
771
To page:
779
(
Total pages:
9
)
Abstract:
Toxic selenium (Se) concentrations were found recently in shallow groundwater in the west side of the San Joaquin Valley in California. The objective of the present work was to evaluate whether excessive leaching, variations in pH, and the presence of competing ions may contribute to Se solubilization and accumulation in the drainage water. Selenium desorption from a Ca-Kaolinite suspension deviated considerably from the corresponding adsorption isotherm. Raising the suspension pH from 5.6 to 8.7 resulted in the release of all the Se present in the system into the solution phase. Decreasing the pH from 5.6 to 3.6, reduced Se+6 and Se+4 concentrations in the solution by a factor of 3 and 2, respectively. When adding P at a 10:1 P-to-total Se molar ratio, Se+4 and Se+6 concentrations in the solution increased from 1.5 to 2.3 and from 2.4 to 2.6 pM, respectivley. Sulfate ions at the same, or higher, molar ratios had no apparent effect on Se solubilization. © 1987, Taylor & Francis Group, LLC. All rights reserved.
Note:
Related Files :
Competing ions
dilution hysteresis
pH
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More details
DOI :
10.1080/00103628709367860
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29225
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:45
Scientific Publication
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