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

• Authors: Jinzhang Gao , Kanjun Sun , Wu Yang , Huixian Zhou
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

p-nitrobenzene-azo-naphthol; oscillating chemical system; analyte pulse perturbation technique

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2005
• Volume: 3
• Issue: 3
• Pages: 502-510

Dates

published

1 - 9 - 2005

online

1 - 9 - 2005

Contributors

author

Jinzhang Gao

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

author

Kanjun Sun

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

author

Wu Yang

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

author

Huixian Zhou

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

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Identifiers

DOI

10.2478/BF02479278