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Determination of p-nitrobenzene-azo-naphthol by an oscillating chemical reaction using the analyte pulse perturbation technique

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Central European Journal of Chemistry

Abstract

A simple analytical method for the determination of p-nitrobenzene-azo-naphthol was proposed by a sequential perturbation with different amounts of p-nitrobenzene-azo-naphthol on an oscillating chemical system. The method involves a Cu(II)-catalysed oscillating reaction between hydrogen peroxide and sodium thiocyanate in alkaline medium with the aid of continuous-flow stirred tank reactor (CSTR). A good linear relationship between the changes, oscillation amplitude or/and period, and the concentration of p-nitrobenzene-azo-naphthol was obtained. The use of analyte pulse perturbation technique provides a possibility of sequential determination in a same oscillating system, due to a new steady state that reappeared rapidly after each perturbation. The calibration curve fits a linear equation very well when the concentration of p-nitrobenzene-azo-naphthol ranging from 5.2×10−7 to 3.3×10−3M. Influence of temperature, injection point, flow rate and reactants variables on this system were investigated in detail.

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Authors and Affiliations

  1. Department of Chemistry, Northwest Normal University, 730070, Lanzhou, P.R. China

    Jinzhang Gao, Kanjun Sun, Wu Yang & Huixian Zhou

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  1. Jinzhang Gao
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  2. Kanjun Sun
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  3. Wu Yang
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  4. Huixian Zhou
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Gao, J., Sun, K., Yang, W. et al. Determination of p-nitrobenzene-azo-naphthol by an oscillating chemical reaction using the analyte pulse perturbation technique. cent.eur.j.chem. 3, 502–510 (2005). https://doi.org/10.2478/BF02479278

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  • DOI: https://doi.org/10.2478/BF02479278

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