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For reaction 1 using the chelating agent anti-2-hydroxy-5-nonylbenzophenone oxime, the reaction orders for [Cu2+], the active isomer of the oxime, and [H+] were measured experimentally by using a rotating diffusion cell. The reaction orders were first order in [Cu2+], first order in the active isomer of oxime, and negative first order in [H+]. The concentration of copper solution ranged from 1.574 X 10"2 mol/dm3 (1000 ppm) to 1.574 X 10"1 mol/dm3 (10000 ppm), the pH ranged from 3.3 to 4.5, and the purified oxime concentration in decane ranged from 0.05 mol/dm3 to 0.125 mol/dm3. Extrapolation of the diffusion cell data for the kinetically limited case was an important advancement of the technique. The forward and reverse reaction rate constants were calculated; the forward reaction rate constant is 4 X 10-8 m/s, and the reverse reaction rate constant is 2 X 10~n m4/(mol s). These results were obtained using a resistance model of copper transport.