Determination of p-nitroaniline by the tartrate-acetone-Mn2+ -KBrO3-H2SO4 double organic substrate oscillating system using non-equilibrium stationary state

Abstract

This paper described the determination of p-nitroaniline in a double organic substrate oscillating system of tartrate-acetone-Mn2+ -KBrO3-H2SO4. Under the optimum conditions, temperature was chosen as a control parameter to design the bifurcation point and proposed a convenient method for determination of p-nitroaniline. Results showed that the system consisting of 3.5 mL 0.06 mol L-1 tartrate, 4.0 mL 0.7 mol L-1 H2 SO4, 1.5 mL 1.5 × 10-4 mol L-1 MnSO4, 4.0 mL 0.4 mol L-1 acetone and 7.0 mL 0.05 mol L-1 KBrO3 was very sensitive to the surrounding at 33.5°C. A good linear relationship between the potential difference and the negative logarithm concentration of p-nitroaniline was obtained to be in the range of 2.50 × 10-7μ3.75 × 10-5 mol L-1 with a lower detection limit of 2.50 × 10-8 mol L-1. © Versita Warsaw and Springer-Verlag Berlin Heidelberg 2009.