To determine potassium in inorganic sample tetrapheny lboron sodium of surfeit wasreturn-titrated by cation activator cetyltrimethylammonium bromide with methyl orange as indica-tor.

• 本文提出了以甲基橙为指示剂，用阳离子活性剂十六烷基三甲基溴化铵返滴定过量的四苯硼化钠测定钾。