在络合滴定中研究表面活性剂对铬天青S、二甲酚橙、铬菁R、PAN和邻苯二酚紫等指示剂的作用已有不少评论及介绍。而对甲基百里酚蓝(MTB) 指示剂的研究,作者曾有过初步的介绍。 本文主要对溴化十六烷基吡啶(CPB)存在下,用MTB作金属指示剂进行了研究。指出镧、铋、锌、铟和镉等金属离子,在CPB存在下与MTB生成络合物的pH范围改变、灵敏度提高、吸收峰红移对比度增大,或被EDTA The role of surfactant in the complexation titration of chrome azure S, xylenol orange, chromium cyanine R, PAN and pyrocatechin indicator has been a lot of comments and introduction. The study of methyl thymol blue (MTB) indicator, the author had a preliminary introduction. In this paper, we studied the use of MTB as a metal indicator in the presence of cetyl pyridinium bromide (CPB). Pointed out the metal ions such as lanthanum, bismuth, zinc, indium and cadmium, the pH range of complexes with MTB in the presence of CPB changes, the sensitivity increases, the absorption peak redshift contrast increases, or EDTA