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This article in SSSAJ

  1. Vol. 44 No. 2, p. 265-268
     
    Received: July 26, 1979
    Published: Mar, 1980


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doi:10.2136/sssaj1980.03615995004400020013x

Application of Elovich Equation to the Kinetics of Phosphate Release and Sorption in Soils1

  1. S. H. Chien and
  2. W. R. Clayton2

Abstract

Abstract

Experimental data on the phosphate release and sorption in soils, when inadequately described by a first-order kinetic reaction, are often interpreted as a combination of two or three simultaneous first-order reactions. A simple modified Elovich equation in the form: q = (1/β) ln (αβ) + (1/β) ln t was derived to fit the reported experimental data in literature that failed to conform to a single first-order kinetic equation. In this equation, q is the amount of phosphate released or sorbed, and α and β are constants. The equation successfully described the data as a single straight line that covers the entire course of reaction time. It also appears that constants of α and β may be used for comparison of reaction rates of phosphate release or sorption in different soils.

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