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Polarographic Studies of Dipicrylamine. IV. Polarographic and Amperometric Determinations of Potassium with Sodium Dipicrylaminate
Author(s) -
Lin ZuiFeng
Publication year - 1962
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196200014
Subject(s) - chemistry , polarography , amperometry , amperometric titration , titration , solubility , solubility equilibrium , potassium , potassium hydroxide , chromatography , sodium hydroxide , sodium , inorganic chemistry , electrode , electrochemistry , potentiometric titration , organic chemistry
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 electolyte. The constant potential applied was —1.8 volt vs. a Hg‐pool electrode and the temperature was 0—0.3°C. 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.