Kinetic Determination of 2,7-Dihydroxynaphthalene by Using Belousov-Zhabotinsky Electrochemical Oscillation System
A new analytical approach for the kinetic determination of 2,7-dihydroxynapthalene (2,7-DHN) by perturbation effect with its narrow concentration range on Belousov-Zhabotinsky (BZ) oscillator catalyzed by tetra-aza-macrocyclic copper complex catalyst ([CuL](ClO 4 ) 2 was reported in this paper. The Ligand “L” in this complex is 5,7,7,12,14,14-hexemethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. Perturbation experiments were performed after optimizing the oscillation parameters which indicates that the change in the oscillation amplitude (ΔA) is directly proportional to the concentration of 2,7-DHN added in the range of 4.50 × 10 -4 mol L -1 to 1.80 × 10 -3 mol L -1 with the correlation coefficient of 0.98. The calculated relative standard deviation (RSD) from the 6 measurements obtained by the injection of 5.00 × 10 -3 mol L -1 is 1.90 %. The lower limit of detection (LOD) is 2.10 × 10 -4 mol L -1 . Factors that influence the oscillation system were studied. A reaction perturbation mechanism was proposed based on a novel FKN model.
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