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Karl Fischer Method to Determine Moisture Content

Karl Fischer Method to Determine Moisture Content

Karl Fischer is a classic titration method in analytical chemistry that uses Coulometric or Volumetric titration to measure moisture content in solids, liquids and gases.  The technique was developed by Karl Fischer, who was a chemist working at a Petrochemical company in Germany in the 1930’s. The technique is based upon a reagent which reacts with water and converts the water into a non-conductive chemical.  The Karl Fischer method is one of the few techniques that will measure water content and will not be affected by other volatiles present in a sample.

There are two types of Karl Fischer titration one is Volumetric Karl Fischer. This method is based on the amount or volume of reagent used in the titration.  The samples are dissolved in a solvent before the titration begins and a reagent is added until the water is removed.  The other method is known as Coulometric Karl FischerWith this method the titrant is generated electrochemically in the titration cell.  Iodine is generated by applying a current reacts with moisture, and the amount of iodine consumed by this reaction is calculated from the quantity of electricity.  These Karl Fischer methods can accurately analyse 1ppm – 100% water in any matrix.

For over 30 years Mitsubishi has been considered the gold standard in Coulometric and Volumetric Karl Fischer Titration and these methods are widely used in the solvent, pharmaceutical and chemical industries. To find out more get in touch on 0845 8738181, email uksales@a1-envirosciences.co.uk, or click here to view our Karl Fischer range a1-envirosciences.