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Zinc sorption by some Torrifluvents soil of Sub-Saharian region South of Libya

R. A. Al-Tamimi.




Abstract

Zinc sorption by four Torrifluvents soils from Sub-Saharian region, south of Libya was evaluated by equlibirating soil samples with concentrations of Zn covers a range of 0 to320 ug/ml. Effect of zinc carrier were also examined by using two carriers i.e. sulphate and EDTA. Results obtained show that all soils have high affinity for Zn sorption. Sorptionisotherm of L (high affinity) type was noticed with zinc sulpate wheras S (low affinity) typewas noticed with EDTA. Curviline relation between sorped zinc and zinc concentration insolution was proved by excellent fit of sorption to Frundlich equation. High mean values forsorption coefficient were noticed with sulphate (2.658) compared to EDTA carriers (0.350),While low mean value for regression coefficient (1/n) for mineral carrier (0.354) was foundcompared to organic carrier (1.376). Sorption coefficient were significantly correlated withclay, silt, carbonate and organic matter contents in case of sulphate carrier only. Whilenegatively correlated with carbonate and organic matter contents when EDTA was used.

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