【摘要】 通过配合0.5mol·L-1硫酸溶液中二苯胺磺酸根在一支铂电极上的氧化和0.05mol·L-1硫酸溶液中高锰酸根在另一支铂电极上的还原,构建了类似可逆电对的双安培检测体系,在两铂电极间电位差为OV时,实现了流动注射不可逆双安培法测定二苯胺磺酸盐。二苯胺磺酸盐溶液和高锰酸钾溶液被隔离在两个用盐桥相连的电极室中,以避免两者发生化学均相反应。在试验条件下,回路电流与二苯胺磺酸根的浓度在2.0×10-6-2.0×10-4mol·L-1范围内呈线性关系,检出限为7.0×10-7mol·L-1(S／N=3)。连续11次测定1.0×10-5mol·L-1二苯胺磺酸钠,电流值的RSD为0.52％。方法简单快速,可用于工业产品中二苯胺磺酸盐的测定。更多还原

【Abstract】 A new method for the determination of diphenylamine-4-sulfonate (DPAS) by FI-irreverisible biamperometry was proposed. A biamperometric detection system, analogous to a reversible redox electrode couple system, was established by matching the oxidation of DPAS at one Pt-wire electrode in [c(H2SO4)] 0. 5mol · L-1 H2SO4 solution with the reduction of MnO- at the other Pt-wire electrode in a H2SO4 solution of same concentration. The analytical current signals were obtained by this system under an optimized condition with a potential difference (△E) of 0V between two electrodes. To avoid the homogenous interaction between the DPAS solution and permanganate solution, they are separated in two reaction chambers which are connected by a salt bridge. Under the optimized conditions proposed, linear relationship between the circuit current and the concentration of DP AS was obtained in the range of 2. 0 × 1(T6 -2. 0 × 1104 mol · L-1 of DPAS, with a detection limit of 7. 0×10-7mol · L-1(S/N=3). RSD’s obtained by 11 successive determinations at the concentration level of 1. 0×10-5mol · L-1 of DPAS was 0. 52%. The proposed method has been applied to the analysis of industrial products and simplicity and rapidity of the method were approved.更多还原