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פותח על ידי קלירמאש פתרונות בע"מ -
Ionic strength effect on pH dependent zinc adsorption by perlite: Modelling vs. empirical results
Year:
2014
Source of publication :
Acta Horticulturae
Authors :
בר-יוסף, בניהו
;
.
זילבר, אבנר
;
.
Volume :
1034
Co-Authors:
Bar-Yosef, B., AgriEcology Group, Katif Research Center, Sedot Negev 85200, Israel
Ben Asher, J., AgriEcology Group, Katif Research Center, Sedot Negev 85200, Israel
Silber, A., Agricultural Research Organization, Bet Dagan 50250, Israel
Facilitators :
From page:
451
To page:
458
(
Total pages:
8
)
Abstract:
Small perlite volume per plant and strong root activity induce large fluctuations in ionic strength (I) and pH in the growth substrate. We investigated experimentally and by modelling the combined effect of pH and I on Zn partitioning between solution and solid phases of perlite suspensions. Empirically obtained adsorption isotherms had a typical Langmuir shape at each pH with maximum adsorption of 7 mmol kg-1 Zn (pH 8) over a solution concentration range of 0 to 0.3 mM Zn. Zinc adsorption declined as suspension pH decreased from ∼8 to ∼5 or as I increased from 0.001 to 0.01 and 0.1 M. The effect of I stemmed from its effect on perlite surface charge vs. pH relationship. Considering the experimental variability in pH and I, the agreement between empirical and model computed adsorption is satisfactory, both in new and used perlite. The estimated Zn adsorption to organic matter found in used perlite was two orders of magnitude higher than to intact perlite, both per kg adsorbent.
Note:
Related Files :
Affinity constants
Organic matter
Solution concentration
Surface charge
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
21003
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:40
Scientific Publication
Ionic strength effect on pH dependent zinc adsorption by perlite: Modelling vs. empirical results
1034
Bar-Yosef, B., AgriEcology Group, Katif Research Center, Sedot Negev 85200, Israel
Ben Asher, J., AgriEcology Group, Katif Research Center, Sedot Negev 85200, Israel
Silber, A., Agricultural Research Organization, Bet Dagan 50250, Israel
Ionic strength effect on pH dependent zinc adsorption by perlite: Modelling vs. empirical results
Small perlite volume per plant and strong root activity induce large fluctuations in ionic strength (I) and pH in the growth substrate. We investigated experimentally and by modelling the combined effect of pH and I on Zn partitioning between solution and solid phases of perlite suspensions. Empirically obtained adsorption isotherms had a typical Langmuir shape at each pH with maximum adsorption of 7 mmol kg-1 Zn (pH 8) over a solution concentration range of 0 to 0.3 mM Zn. Zinc adsorption declined as suspension pH decreased from ∼8 to ∼5 or as I increased from 0.001 to 0.01 and 0.1 M. The effect of I stemmed from its effect on perlite surface charge vs. pH relationship. Considering the experimental variability in pH and I, the agreement between empirical and model computed adsorption is satisfactory, both in new and used perlite. The estimated Zn adsorption to organic matter found in used perlite was two orders of magnitude higher than to intact perlite, both per kg adsorbent.
Scientific Publication
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