ZINC SORPTION BY SOME TORRIFLUVENTS SOIL OF SUB-SAHARIAN REGION SOUTH OF LIBYA

R. A. Al-Tamimi.

doi:10.9755/ejfa.v12i1.5134

Authors

R. A. Al-Tamimi. Soil & Water Sci. Dept., College of Agric., Sebha Univ., P.O. Box 19332 , Libya

DOI:

https://doi.org/10.9755/ejfa.v12i1.5134

Keywords:

Freundlich equation, Langmuire equation, sandy soils, sorption, Temkin equation, Zn-sulphate, and Zn-EDTA .

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 to 320 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. Sorption isotherm of L (high affinity) type was noticed with zinc sulpate wheras S (low affinity) type was noticed with EDTA. Curviline relation between sorped zinc and zinc concentration in solution was proved by excellent fit of sorption to Frundlich equation. High mean values for sorption 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 found compared to organic carrier (1.376). Sorption coefficient were significantly correlated with clay, silt, carbonate and organic matter contents in case of sulphate carrier only. While negatively correlated with carbonate and organic matter contents when EDTA was used.