SIMULTANEOUS KINETIC DETERMINATION OF NICKEL(II) AND COBALT(II) WITH 5-OCTYLOXYMETHYL-8-QUINOLINOL IN THE NONIONIC SURFACTANT MICELLAR SYSTEM

The formation rate of Ni(II) and Co(II) complexes with 5-octyloxymethyl-8-quinolinol was investigated in nonionic surfactant systems. The distribution of metal ions and of ligands between the aqueous and micellar phases affected the reaction rate. The slowest reaction was obtained for Triton X-100 and there action rate in the micellar phase was thirty times slower than the rate in the aqueous phase. The slow reaction in the micelle was applied to the determination of Ni(II) and Co(II). The formation of the Co(II) complex was forty-four times faster than Ni(II )at pH 7.0. The working curve for each metal was linear in the concentration range between (0.2-5.0) X 10(-5) mol dm-3.