Zahir Rawajfih and Ansam Al-Akhrass, Natural Resources and Environment, Jordan University of Science and Technology, Irbid, Jordan
Adsorption of Cu2+ and Cd2+ in three soils of different physical and chemical properties was investigated (K1, K7, and Aj). The effect of amending the soils with organic agricultural waste substances (pomegranate peel and date-palm stems and leaves) on the sorption behavior of Cu2+ andCd2+ was also investigated. The relevant soil properties included organic carbon content, calcium carbonate content, texture, cation exchange capacity, iron oxides content, clay types and contents. Cadmium initial concentration of up to 150 mg /L and copper initial concentration up to 175 mg/L were used in the sorption experiments of unamended soils, while the highest initial concentrations with the amended soils were 200 mg /L and 600 mg /L for Cu2+ and Cd2+, respectively . The results showed that copper and cadmium sorption by soils increased with the initial concentration. The sorption data conformed well to Langmuir model, with R2 values above 0.97. The qmax for cadmium sorption by the three soils were 4.18, 4.45, and 3.68 mg/g; and for copper the qmax were 3.95, 4.18, and 4.29 mg/g. The effect of amendments on the sorption of Cu2+ and Cd2+ was different in the three soils.