A method for the determination of trace manganse which can catalyze the discoloring reaction of potassiun periodate to o研究了在NaHPO－NaOH缓冲溶液中痕量锰催化高碘酸氧化镁试剂Ⅱ〔即－（－硝基苯偶氮）－－萘酚〕使之褪色，并研究了催化动力学条件。