Water Determination in Starch by Karl Fischer Titration

Water is only released slowly from starch flour. At room temperature, the determination takes 10 – 15 minutes, and the results are too low. Drying, too, is an unsuitable method for determining the actual water content.

It is advisable to carry out the titration at 50°C. In this case the titration takes about 5 minutes, the end point is stable and the results are reproducible.

One- or two-component volumetric titration can be applied. Hydranal-Water Standard 10.0, Hydranal-Water Standard 1.0, and Hydranal-Standard Sodium Tartrate Dihydrate are suitable for determination of the titer or control of the volumetric determination.

Download the full Laboratory Report for Starch (L 072) here

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Volumetric reagents: Water Standards: Auxiliaries:
34805 HYDRANAL-Composite 5
34741 HYDRANAL-Methanol dry
37817 HYDRANAL-Methanol Rapid34801 HYDRANAL-Titrant 534800 HYDRANAL-Solvent
34849 HYDRANAL-Water Standard 10.034425 HYDRANAL-CRM Water Standard 10.034828 HYDRANAL-Water Standard 1.034426 HYDRANAL-CRM Water Standard 1.034696 HYDRANAL-Standard Sodium Tartrate Dihydrate34424 HYDRANAL-CRM Sodium Tartrate Dihydrate 34241 HYDRANAL-Molecular Sieve 0.3 nm34788 HYDRANAL-Humidity Absorber
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