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根据动力学观点讨论了应用薄膜电位测定单独离子的活度问题，并用钾粘土薄膜电极在一定浓度范围内测定了单纯ＫＣｌ溶液和混合溶液中钾离子活度；测定结果与Ｄｅｂｙｅ－Ｈｉｉｃｋｅｌ极限公式计算值符合，证明了钾粘土薄膜电位确能反映单独离子的活度。
According to the kinetic viewpoint, the application of the membrane potential to measure the activity of single ions was discussed. The activity of potassium ions in pure KCl solution and mixed solution was measured with potassium clay film electrode in a certain concentration range. The calculated results were in agreement with the Debye-Hiickel limit formula The values agree that it proves that the potassium clay film potential does reflect the activity of individual ions.