Soil Science Society of America Journal · 1980 · 1.7K citations · 0 references
Natural SciencesEarth SciencesSoil SciencesSoil BiogeochemistrySoil ChemistrySoil ScienceGeochemical KineticsNutrient Retention In SoilsPhosphate MineralogyPhosphorus CycleSoil GeochemistrySoil Phosphorus ChemistryNutrient Release KineticsPhosphate Ion ReleasePhosphate Release DynamicsPhosphate SorptionPhosphorus Release DynamicsPhosphorus SorptionPhosphorus Uptake KineticsSoil Nutrient Sorption
Experimental data on phosphate release and sorption in soils are often interpreted as a combination of two or three simultaneous first‑order reactions when a single first‑order kinetic model is inadequate. The study derived a simple modified Elovich equation to fit phosphate release and sorption data that could not be described by a single first‑order kinetic model. The modified Elovich equation \(q = \frac{1}{\beta}\ln(\alpha\beta) + \frac{1}{\beta}\ln t\) relates the amount of phosphate released or sorbed (q) to time, with α and β as constants. The equation described the data as a single straight line over the entire reaction time, and the constants α and β can be used to compare reaction rates across different soils.
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.