[01] Abdul Karim Ahmed Al-Siddiq, Environment Science Department, Sebha University, Sebha, Libya. [02] Abdulsalam Mohamed Obeidat, Biology Department, Sebha University, Sebha, Libya. [03] Wafa Khalleefah Amhimmid, Chemistry Department, Azzaytuna University, Tarhuna, Libya. [04] Emhemmad Jumha Emhemmad, Chemistry Department, Sebha University, Taraghun, Libya.

The aim of this study was to investigate the adsorption of phosphorous to soils and its availability to be active in Wadi-Etba region (south west of Libya). The effects of some properties of these soils on phosphorous adsorption have been studied and characteristics of adsorption have also been investigated. Seven soil samples were collected from private farms. The chemical and electrochemical analysis data were used to evaluate the adsorption parameters for study of different phosphorous adsorption isotherms in these soils. The adsorption process was tested by applying Freundlich, Langmuir Model isotherms. The isotherms parameters (Kf,n), (b, Kl), (K,y) were used to predict the type of adsorption layer, the active Sites involved in adsorption process and adsorption capacity of phosphorous onto soil. The results showed low adsorption of phosphorus onto all studied soils and quantity of adsorbed phosphorous different with different additional initial concentration and studied soil properties. The adsorption isotherms for phosphorous adsorbed onto all studied soils were of S Shaped according to Giles classification and followed the fitting data of Freundlich equation. This was discussed on the basis that Unequal energy of adsorption centers developed that may allow to adsorption multilayers on soil surface, The results showed different adsorption capacity for studied soils and found to be decreased as: Tokroten < Om Alhmam < Tasawa < Dojal < Sobaitat < Marhba < Agar. The negative values of free energy (ΔG) showed that the adsorption process of phosphorous was spontaneous Thermodynamically and related significantly to freundlich (Kd) constant.

Adsorption, Phosphorous, Soil, Wadi-Etba, Freundlich, Langmuir Isotherms

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