3.4. Effect of the amount of DMDC
In order to obtain hydrophobic copper complex, DMDC was selected as ligand and the influence of its amount on the recovery was examined by varying amounts of 0.0–0.5 mg. The results are depicted in Fig. 4. The quantitative recovery values were obtained for Cu(II) in the presented system in the range of 0.1–0.5 mg of ligand. 0.2 mg of DMDC was selected as optimum value.