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Published online 27 February 2006
Published in Soil Sci Soc Am J 70:550-554 (2006)
DOI: 10.2136/sssaj2005.0065N
© 2006 Soil Science Society of America
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Flow-Through and Batch Methods for Determining Calcium-Magnesium and Magnesium-Calcium Selectivity

Tom M. DeSuttera,*, Gary M. Pierzynskib and Luke R. Bakerb

a USDA-ARS, National Soil Tilth Lab., Ames, IA, 50011, formerly with Dep. of Agronomy, Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506
b Dep. of Agronomy, Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506


Figure 1
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  		Fig. 1. Schematic drawing of the supplies and application design used to conduct the flow-through experiment.

 

Figure 2
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  		Fig. 2. Calcium-Mg and Mg-Ca exchange isotherms and average values for the Gibbs free energy of exchange ({Delta}Gex) for a montmorillonitic soil derived using flow-through (FTEM) and batch (BEM) equilibration methods. Numbers in parentheses following the {Delta}Gex values are the coefficients of variation of the {Delta}Gex replications. Ei represents the equivalent fraction of Ca or Mg in the solution and exchanger phase for either the Ca-Mg or Mg-Ca reaction, respectively.

 




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