Using the kinetic approach for the adsorption of base ions (Ca, Mg, Na, K) by the calm flow method in some soils in the northern of Iraq

Abstract

Abstract. Four soils were selected from northern Iraq, within the ranks (Mollisols, Inceptisols) from the provinces of Dohuk, Erbil and Sulaymaniyah from different agricultural fields from the root zone (0-0.30 m). Their physicochemical and mineral properties were estimated to study thermally isotropic adsorption by the calm flow method of soil columns using an electrolytic solution. At concentrations of (3) mmol charge.L-1, containing Ca, Mg, K, and Na ions in two repetitions at a constant temperature of approximately 298 ± 2 K. Stabilization filters were collected in which the ions were estimated according to the coefficients. The results indicated that the reactions ranged from medium alkaline to medium acidic. (6.7- (7.8), unaffected by salinity (1.44 - 0.29) dS.m-1 with an ion exchange capacity between (22.43 - (33.9 Cmolc.Kg-1) and is calcareous soil due to its high content of total carbonate minerals (-112) g.kg-1  .In addition to the calcareous origin material, and it has a high clay content (304-534) g.kg-1  with the predominance of smectite, chlorite, Ilite, kaolinite and Ilite clay minerals, the nature of ion exchange using the kinetic entrance of adsorption showed a clear effect of the porous fats and the contact time of the electrolyte solution on the adsorbed quantities depending on the type of soil. Show the mathematical description of the process of arranging the kinetic equations according to their validity as follows: Power > First order > Parabolic > Elovage > Zero order