Abstract: Karl Fischer reagent comprising iodide, sulphur dioxide with an initial concentration above 0.5 M, and imidazole/imidazole derivative dissolved in alcoholic solvent, whereby the molar ratio between the initial imidazole/imidazole derivative concentration and the initial sulphur dioxide concentration is above 10. The reagent contains a modifying substance that is an aliphatic hydrocarbon, or a primary or secondary alcohol, or a combination thereof. A method for the determination of water content by means of Karl Fischer coulometric titration in a diaphragm-free cell, whereby the Karl Fischer reagent is used, and the coulometric titration is carried out in a diaphragm-free cell. Use of the Karl Fischer reagent in a method for the determination of water content by means of coulometric titration.

Abstract: A device for the coulometric determination of water by a Karl Fischer reaction comprising a membrane-free measuring cell that contains a liquid reagent, an iodine indicating means, an anode, a cathode and a casing around the cathode to define a cathode space. The casing has an opening through which the cathode space communicates with the liquid reagent. A maneuverable drainage device including a plunger is provided to drain-off liquid reagent in the cathode space through the opening.