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A laboratory experiment was conducted to study zinc adsorption at eight concentrations (0, 25, 50, 100, 150, 200, 250 and 300 mg L-1) by using ZnSO4.7H2O. with two replicates were used for each concentration, where 20 mL of zinc solution was added to 1 gram of natural zeolite, synthetic zeolite, soil 1, and soil 2. Langmuir equation was used to describe the relationship between zinc adsorption and its concentration. Additionally, the Freundlich equation was used to describe adsorption of ions. Freundlich equation was found to be more important than Langmuir equation, as the values of k and b in Freundlich equation and the R2 values for natural and synthetic zeolites were higher in both soils. The second experiment involved kinetics. Zeolite and soil were kept moist at field capacity throughout the incubation period. Zinc was extracted using DTPA after each incubation period, with two replicates to study the rate of zinc release from zeolite and soil over time and its concentration in the solution. results showed a decrease in the availability of added zinc with increasing incubation time. The highest concentration of available zinc was found when zinc was added to synthetic zeolite, reaching 346 µg Zn+2 ml-1 at the end of the incubation period. The second-order equation was the most effective in describing the behavior of zinc and its reaction rate during the incubation period, representing the period of crop growth.


Adsorption Calcareous soil Zeolite Zinc

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Al-Mashhdany, M. A. R. ., & Al-Hadethi, A. A. H. . (2023). Adsorption Reaction and Kinetics of Zn on Zeolite Mineral Comparing with Two Calcareous Soils. Basrah Journal of Agricultural Sciences, 36(2), 199–214.


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