| Autor: |
DeSutter, Tom M., Pierzynski, Gary M., Baker, Luke R. |
| Předmět: |
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| Zdroj: |
Soil Science Society of America Journal; Mar/Apr2006, Vol. 70 Issue 2, p550-554, 5p, 2 Charts, 1 Graph |
| Abstrakt: |
Conducting binary-exchange experiments is a common way to identify cationic preferences of exchanger phases and the two most common approaches are the flow-through and batch methods. The objectives of this research were to provide the materials and methods for both flow-through and batch equilibration techniques and to compare Ca-Mg and Mg-Ca selectivity when using these two methods on a montmorillonitic soil. The methods were evaluated by comparing both the Gibbs free energy values (ΔGex) and selectivity diagrams derived from the flow-through and batch exchange reactions. The ΔGex values for the Ca-Mg reaction were 634 and 444 J mol-1 as determined by the flow-through and batch methods, respectively, indicating an exchanger preference for Ca. Exchanger preference for Ca was also evident in the Mg-Ca reaction with ΔGex values of -882 and -784 J mol-1 for the flow-through and batch methods, respectively. The flow-through and batch methods worked very well for determining cation selectivity and results indicate no significant differences existed between the two methods. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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