Volume 12, Issue 1 (2010)
JAST 2010, 12(1): 99-110 |
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Reyhanitabar A, Ardalan M, Gilkes R J, Savaghebi G. Zinc Sorption Characteristics of Some Selected Calcareous Soils of Iran. JAST 2010; 12 (1) :99-110
URL: http://jast.modares.ac.ir/article-23-2393-en.html
URL: http://jast.modares.ac.ir/article-23-2393-en.html
1- Department of Soil Science, Faculty of Agriculture, University of Tabriz, Tabriz, Islamic Republic of Iran.
2- Department of Soil Science, Faculty of Water and Soil, University of Tehran, Karaj, Islamic Republic of Iran.
3- School of Earth and Geographical Science, Faculty of Natural and Agricultural Science, University of Western Australia, Crawley, WA 6009, Australia.
2- Department of Soil Science, Faculty of Water and Soil, University of Tehran, Karaj, Islamic Republic of Iran.
3- School of Earth and Geographical Science, Faculty of Natural and Agricultural Science, University of Western Australia, Crawley, WA 6009, Australia.
Abstract: (6212 Views)
This study was carried out to obtain quantitative relationships between Zn in equilibrium solution and that retained by 20 calcareous soils. Soils were brought into equilibrium with varying solution concentrations of Zn, and the amounts removed from solution were used to check the fit to six adsorption isotherms, namely, Freundlich, Langmuir, Temkin, Gunary, two surface Langmuir and Adjusted Freundlich. Zinc sorption and desorption data showed hysteresis which indicates adsorption and desorption mechanisms not being the same. Fits of adsorption equations showed that Freundlich equation did not describe Zn sorption in most of the soils at low equilibrium concentrations, but after removal of the three first concentration points this equation showed a best fit to the data. The single surface Langmuir equation did not describe Zn sorption data, but a two surface Langmuir equation showed statistically significant fits to the data for some of the selected soils. Temkin equation described data only at low equilibrium concentrations.
Subject:
Soil Science
Received: 2010/01/24 | Accepted: 2010/01/24 | Published: 2010/01/24
Received: 2010/01/24 | Accepted: 2010/01/24 | Published: 2010/01/24
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