Comparison of Batch and Miscible Displacement Techniques to Describe Potassium Adsorption Kinetics in Delaware Soils

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Abstract
Kinetics of potassium (K) adsorption in three soils were compared using batch equilibrium and miscible displacement techniques. The batch method reached equilibrium sooner than miscible displacement in all cases. Greater clay content did not affect the equilibrium time using the batch technique but increased that time for miscible displacement.The percent‐K adsorption was closely related to (time)1/2 indicating diffusion‐controlled exchange. Relative rate coefficients were significantly higher for batch than for miscible displacement.Miscible displacement simulates solute movement in soils under field conditions, and since flow rate and leachate volume can easily be adjusted, miscible displacement has great advantages for rapid reactions. Batch techniques require separation of solid and solution by centrifugation and/or filtration in which the time of separation of solid from liquid phases is not precisely known.

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