Determination of <Emphasis Type="Italic">p</Emphasis>-nitrobenzene-azo-naphthol by an oscillating chemical reaction using the analyte pulse perturbation technique |
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Authors: | Jinzhang Gao Kanjun Sun Wu Yang Huixian Zhou |
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Institution: | (1) Department of Chemistry, Northwest Normal University, 730070 Lanzhou, P.R. China |
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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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Keywords: | p-nitrobenzene-azo-naphthol oscillating chemical system analyte pulse perturbation technique |
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