Figure 3. Effect of Triton X-114 concentration on copper ion extraction by CPE. Conditions: 15 mL of 0.2 µ g mL -1 Cu 2+ ion at pH 5.7±0.3, 1.5 mM DFID different concentration of TritonX-114, 0.5 % (w/v) NaCl, eluting solution 0.5mL of 0.50 M HNO methanol.