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研究了在pH 10的氨缓冲溶液中,痕量M n(Ⅱ)对高碘酸钠氧化靛蓝褪色反应具有显著的催化作用,据此建立了催化动力学光度法测定M n(Ⅱ)的新方法。讨论了催化体系的反应条件,动力学参数和共存离子的影响。该催化反应为一级反应,检出限为6.4×10-11g/mL。表观反应速率常数K=5.48×10-4s-1,表观活化能Ea为111.9kJ/m ol,方法的线性范围为0—4μg/L(r=0.9999),方法的相对标准偏差为3.3%,加标回收率为96%—104%。
The catalytic effect of trace Mn (Ⅱ) on the fading reaction of indigo oxidation by sodium periodate was studied. The catalytic kinetic spectrophotometric method for the determination of Mn (Ⅱ) was established. method. The reaction conditions, kinetic parameters and the influence of coexisting ions are discussed. The catalytic reaction for the first reaction, the detection limit of 6.4 × 10-11g / mL. The apparent reaction rate constant K = 5.48 × 10-4s-1, the apparent activation energy Ea was 111.9kJ / mol and the linear range of the method was 0-4μg / L (r = 0.9999). The relative standard deviation of the method was 3.3 %, The standard recovery was 96% -104%.