Barium ion can catalyze the decolorization reaction of Erichrome Black T and dodecylbenzene solfonic sodium in a pH 5 of weak acid medium.

• Ba~(2+)能在pH5弱酸性介质中催化十二烷基苯磺酸钠(DBS)对铬黑T(EBT)的褪色反应.