Karl Fischer coulometric titration using a diaphragmless cell

Abstract

The authors investigated Karl Fischer coulometric titration using a diaphragmless cell. Many samples, such as hydrocarbons, alcohols and polymers, were analyzed by the present method and the conventional method using a cell with a diaphragm. The relationship between both methods showed good agreement (relation coefficient, r =0.99996). Compounds containing a nitro group showed higher analytical values, because the products electrolyzed at the cathode reacted with the iodine produced at the anode. Present method is suitable for the coulometric titration/the moisture vaporization method in which the moisture in samples is introduced into the electrolyzing cell by heating and purging.