Electrometric determination of alkali metal ions during development of ascending paper chromatography: Electrometric determination in chromatographic development. II

A quantitative method by detective current for alkali metal ions during development of ascending paper chromatography is presented. The applied voltage is D.C. 3.0V constant, and the analytical conditions are examined mainly on the following items ; 1) composition of developers, 2) relations between the amount of samples and height of maximum peak current or the product of current-time, 3) influence of counter ions on the determination, 4) separation of ions in the presences of a large excess of Na+ or K+, and 5) precipitating agents for the mixture of Na+ and K+. The measured deviation in electrometric value is less than 2.6% per μg within 420 μg of Na+ or 525 μg of K+ by this method.