Abstract
Zinc adsorption was studied in ten soils varying in texture or calcareousness of Punjab. Adsorption process was executed by equilibrating 2.5g soil in 25 ml of 0.01M CaCl2 solution containing 0, 5, 10, 15, 20, 25, 70, and 120 mg Zn L-1. Sorption data were fitted to Freundlich and Langmuir adsorption models. The data were best fitted in both linearized Freundlich and Langmuir equations as evidenced by higher correlation coefficient values ranging from 0.87 to 0.98. High clay contents ranging from 8 to 32 % and CaCO3 4.46 to 10.6 % promoted an increase in the amount of adsorbed Zinc in these soils. Adsorption of Zn increased with the increasing level of Zn and also increased with increase in clay, and CaCO3 contents. The maximum adsorption of Zn was observed in the Kotli whereas, the minimum in the Shahdra soil series.

M.S. Ashraf, A.M. Ranjha, M. Yaseen, N. Ahmad, A. Hannan. (2008) Zinc adsorption behavior of different textured calcareous soils using Freundlich and Langmuir models, , Volume-45, Issue-1.
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