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Kinetic determination of aminopyrine by using the bifurcation point in Mn(II)-catalyzed B-Z oscillating chemical system

Jinzhang Gao, Miao Guo, Jie Wang, Jie Ren, Wu Yang

A novel and convenient method with good selectivity and high sensitivity was used to determine aminopyrine. The method is based on the perturbation with different amounts of aminopyrine on the Mn(II)-catalyzed oscillating system, which is being in a non-equilibrium stationary state close to the bifurcation point between non-oscillatory and oscillatory state, using a continuous-flow stirred tank reactor(CSTR). A well linear relationship between the potential difference (i.e., Em= Ep-Eb) and the negative logarithm of aminopyrine amount was found to be in the range of 7.9410-55.62 10-8 mol L-1 and a lower detection limit of 7.2510-9 mol L-1was also obtained. To estimate the reliability, some otherl methods (including regular oscillation) were compared with it together.