Simultaneous Homogeneous Liquid-Liquid Extraction of Ni(II)and Cu(II)Using New vic-Dioxime Derivative

摘要

A new vic-dioxime derivative(2H-1,4-benzothioazine-2,3(4H)dionedioxime,Oxime I)has been synthesized and investigated as a selective complexing ligand for homogeneous liquid-liquid extraction and preconcentration of Ni2+ and Cu2+ ions.Zonyl FSA has been applied as a phase separation agent.The influence of pH,type,and concentration of water--miscible organic solvent,Zonyl FSA,and Oxime I,as well as the effect of different diverse ions on extraction and determination of Ni2+ and Cu2+ ions has been investigated.Under optimum conditions([Oxime I]T = 1.2 x 10~(-3)mol L~(-1),[THF]T = 16.7 % v/v,[FSA]T = 3.2 % m/v,pH = 4.5),5 ng of each Ni2+ and Cu2* in 5.5 mL aqueous phase was extracted quantitatively into 75 mu L of the precipitated liquid phase.Limit of detection of the proposed method was 0.004 ng mL~(-1)for Ni2+ and 0.005 ng mL~(-1)for Cu2+.The proposed method has been extended over extraction and determination of Ni2+ and Cu2+ ions in different synthetic and natural water samples.