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פותח על ידי קלירמאש פתרונות בע"מ -
Zinc adsorption by perlite: Effects of pH, ionic strength, temperature, and pre-use as growth substrate
Year:
2012
Source of publication :
Geoderma
Authors :
בר-יוסף, בניהו
;
.
זילבר, אבנר
;
.
לבקוביץ', אירית
;
.
סוריאנו, שושי
;
.
Volume :
170
Co-Authors:
Silber, A., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Bar-Yosef, B., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Suryano, S., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Levkovitch, I., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
159
To page:
167
(
Total pages:
9
)
Abstract:
Zinc attracts a lot of interest in diverse disciplines of the scientific community. On the one hand, it is an essential micronutrient for plants, animals and humans; on the other hand, it is a soil pollutant. We investigated the roles of time, pH, ionic strength, and temperature in determining Zn partitioning between the solution and solid phases of suspensions of a representative plant-growth substrate (perlite). Zinc adsorption by perlite was dependent on pH, ionic strength, and temperature; it involved a combination of specific chemical affinity to adsorption sites and an electrostatic component that is related to the surface charge and is controlled by pH. Elevating temperature significantly and systematically raised the pH and enhanced Zn adsorption. A single quadratic regression was obtained between solution Zn concentration and pH in fresh perlite suspensions, which may indicate that temperature indirectly affected Zn adsorption by elevating the pH. In contrast, no single regression could be obtained for the suspensions of used perlite, which had previously served as a growth medium, and this may indicate that temperature affected both pH and Zn adsorption. The effect of pH on the apparent activation energy (Ea) for Zn adsorption was significant and each unit increment of pH induced a 4.9kJmol -1 increase in Ea. Specific Zn adsorption modified the perlite charge characteristics, therefore, Zn adsorption indirectly affected the partitioning of other ions, such as P, between the solid and the aquatic phases. A significant effect of 'enhanced P adsorption induced by Zn adsorption' was observed. © 2011 Elsevier B.V.
Note:
Related Files :
Adsorption
Animals
Growth substrates
pH
soil pollution
trace elements
Zinc
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.geoderma.2011.11.028
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26002
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:19
Scientific Publication
Zinc adsorption by perlite: Effects of pH, ionic strength, temperature, and pre-use as growth substrate
170
Silber, A., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Bar-Yosef, B., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Suryano, S., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Levkovitch, I., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel
Zinc adsorption by perlite: Effects of pH, ionic strength, temperature, and pre-use as growth substrate
Zinc attracts a lot of interest in diverse disciplines of the scientific community. On the one hand, it is an essential micronutrient for plants, animals and humans; on the other hand, it is a soil pollutant. We investigated the roles of time, pH, ionic strength, and temperature in determining Zn partitioning between the solution and solid phases of suspensions of a representative plant-growth substrate (perlite). Zinc adsorption by perlite was dependent on pH, ionic strength, and temperature; it involved a combination of specific chemical affinity to adsorption sites and an electrostatic component that is related to the surface charge and is controlled by pH. Elevating temperature significantly and systematically raised the pH and enhanced Zn adsorption. A single quadratic regression was obtained between solution Zn concentration and pH in fresh perlite suspensions, which may indicate that temperature indirectly affected Zn adsorption by elevating the pH. In contrast, no single regression could be obtained for the suspensions of used perlite, which had previously served as a growth medium, and this may indicate that temperature affected both pH and Zn adsorption. The effect of pH on the apparent activation energy (Ea) for Zn adsorption was significant and each unit increment of pH induced a 4.9kJmol -1 increase in Ea. Specific Zn adsorption modified the perlite charge characteristics, therefore, Zn adsorption indirectly affected the partitioning of other ions, such as P, between the solid and the aquatic phases. A significant effect of 'enhanced P adsorption induced by Zn adsorption' was observed. © 2011 Elsevier B.V.
Scientific Publication
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