The adsorption of phosphate by soils rich in palygorskite in the oasis of Alhassa Saudi Arabia

(Ibrahim bin Abdulrahman senses)

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Abstract

Phosphorus sorption by calcareous and gypsifrouse soils rich in palygorskite has been studied.  The P adsorption was measured at 0-60 g 
ml-1.  Most soil samples showed a high affinity for P sorption at low solution concentrations.  At higher P solution concentration, P sorption was accompanied by a change in the slope of the isotherms.  The higher P, the lower pH values were gained.  The reduction in the final pH was related to the amount of P sorbed.  The reference palygorskite showed only a small adsorption capacity for P.  This small sorption indicates that palygorskite is behaving in a similar manner to that of a 2:1 phyllosailicate mineral.  Since the equlibrium solution back ground is CaCl2, the adsorption of P by palygorskite is that probably some of the exchangeable site occupied by Ca.  The contribution of palygorskite to P adsorption is then small.

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