1引言表面活性剂溶于水中形成胶束时，溶液的微观环境发生了很大变化，而使胶束溶液具有增溶、增敏等性质，它可以提高分析灵敏度，简化分析步骤。作者发现，在邻菲啉存在下，Fe3＋对H2O2氧化次甲基蓝褪色反应有催化作用，而体系加入表面活性剂后，对该体系测定的灵敏度有明显 1 Introduction Surfactant dissolved in water to form micelles, the solution of the micro-environment has undergone great changes, leaving micellar solution with solubilization, sensitization and other properties, it can improve the analysis sensitivity, simplifying the analysis steps. The authors found that in the presence of orthophenanthroline, Fe3 + has a catalytic effect on the fading reaction of methylene blue by oxidation of H2O2, and the sensitivity of the system after the addition of the surfactant is obvious