Methods:The method was based on the coloration and discoloration reaction between KIO_3 and acridine orange with trace I~-catalyzed in 0.10 mol/dm~3 citric acid medium. The reaction mechanism was discussed primarily.

• 方法:在0.；10 mol/dm3的柠檬酸介质中；痕量I-催化碘酸钾氧化吖啶橙褪色和生色；并初步探讨了反应机理。