- 作者: 林瑞[木逢]
- 作者服務機構: Contribution from Department of Chemistry, National Taiwan University
- 中文摘要: Polarographic and amperometric methods for the determination of potassium by using sodium dipicrylaminate as the precipitating agent were investigated. Several methods for the location of the end point in the amperometric titration and the method for the calculation of the original concentration of potassium present in the test solution were discussed. In the amperometric titration, the sample solution was presaturated with potassium dipicrylaminate. A 0.1 F sodium hydroxide solution was used as the supporting electrolyte. The constant potential applied was -1.8 volt vs. a Hg-pool electrode and the temperature as 0-0.3℃. Advantages and disadvantages of the methods were discussed. The solubility of potassium dipicrylaminate and the solubility product of dipicrylamine at various temperatures were determined spectrophotometrically. A special type of filter bar used in the solubility and solubility product determinations was described.
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