2003 Volume 76 Issue 11 Pages 2117-2121
A novel analytical method that builds on specific features of non-linear chemical systems far from thermodynamic equilibrium is described. The used oscillating chemical system is the BZ (Belousove–Zhabotinskii) reaction in a non-equilibrium stationary state close to a bifurcation point. The method uses a Pt electrode for monitoring the potential response to a perturbation caused by As(III) ion. A linear response, in which the oscillating amplitude varies versus the logarithm of the As(III) concentration, was found in the range of 1.99 × 10−6–1.27 × 10−4 M. Under optimum conditions, a detection limit of 2 × 10−6 M for As(III) was obtained. The relative standard deviation (%RSD) for As(III) 1.59 × 10−5 M is 7.1 (n = 6).
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