| Titles |
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English :
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Adsorption – desorption reactions of copper in some soils and clay minerals dominating therein
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Arabic :
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تفاعلات الادمصاص وعكس الادمصاص للنحاس فى بعض الأراضي ومعادن الطين السائدة بها
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| Abstract |
Adsorption – desorption reactions of copper at different pH values by alluvial, calcareous, montmorillonite, palygorskite and humic acid were studied. The amount of Cu adsorbed on soils, clay minerals and humic acid increased gradually with increasing the initial concentration of Cu. Increasing pH values from 5.0 up to 6.4 was associated with an increase in Cu adsorption and the obtained results agreed with the conventional Langmuir, Freundlich and Temkin isotherms. The amount of desorbed Cu by alluvial soil exhibited the highest values compared to the calcareous soil, especially at pH 6.4. Alluvial soil showed the highest desorption buffering capacity at various pH values compared to calcareous soil. Increasing the added amounts of Cu increased the desorbed Cu at all pH values for both montimorillonite and palygroskite minerals. The highest increase was observed at pH 5.5, however, the lowest values were obtained at high pH (6.4). The amount of desorbed Cu by montimorillonite exhibited the highest values compared to the palygoriskite one. On the contrary, the amounts of desorbed Cu on montimorillonite were higher than the retained ones, while the opposite trend was observed for palygroskite. Increasing the added amounts of Cu slightly increased the desorbed Cu at all pH values. The highest increase was observed at pH 5.5, however, the lowest values were obtained at low pH (5.0). The amounts of desorbed Cu from humic acid were slightly higher than the retained ones at pH 5.5.
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| Publication year |
2003
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| Availability location |
(معهد بحوث الاراضى والمياه والبيئة)
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| Availability number |
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| Organization Name |
Soil, Water and Environment Research Institute (SWERI)
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| Country |
Egypt
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| Department |
Improvement and Conservation of Cultivated Soils Research
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| Author(s) from ARC |
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| Agris Categories |
Soil chemistry and physics
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AGROVOC
TERMS |
Adsorption.
Calcium carbonate.
Copper.
Desorption.
Humic acids.
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| Proposed Agrovoc |
clay mionerals;palygroskite;
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| Publication Type |
PhD Thesis
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