Volumetric Titration – Water Determination According to Karl Fischer

Volumetric titration is recommended for determining water contents in samples between 0.1 and 100%. With our range of Aquastar® reagents for volumetric water determination according to Karl Fischer, you benefit from high titration rates and accurate, reliable results.

In volumetric Karl Fischer titration, the basis for the determination of water content is the oxidation of sulfur dioxide by iodine in the presence of water. The water content of the sample is determined by measuring the volume of Karl Fischer titrant – consisting of an alcohol, a buffer base, sulfur dioxide, and a known concentration of iodine – that is required to reach the titration endpoint. The sample is completely dissolved or dispersed in a suitable solvent with strict exclusion of atmospheric moisture and then titrated with the Karl Fischer titrant. When all the water in the sample is consumed, the resulting excess of iodine can be determined potentiometrically.

In our comprehensive portfolio of Aquastar® reagents for volumetric KF titration, we supply both one-component reagents that conveniently contain all reactive constituents in one solution, and two-component reagents for faster titration, better buffer capacity, and higher titer stability. We also offer Aquastar® solvents that are especially suitable for water determination in aldehydes and ketones as well as in oils or fats. Our accompanying Aquastar® buffer solutions help maintaining the optimum 5-7 pH range.