Abstract
We examined Karl Fischer titration as a method for accurately quantifying the moisture content of salt. To date, there has been no method for accurately quantifying the moisture content of salt, so the loss on drying and the loss on heating methods have been used to provide an indicative value. In spite of Karl Fischer titration being a useful method for quantifying moisture content, it has not been possible to apply it to salts. Specifically, Karl Fischer titration relies on the extraction of moisture, but salt does not dissolve in this reagent and sufficient moisture can not be extracted. Against this background, we attempted to dissolve salt in the Karl Fischer reagent. We found that the salt could dissolve in ethylene glycol. Therefore, for titration we used a mixed solution obtained by adding 40 mL of ethylene glycol to 100 mL of the Karl Fischer reagent. Using this method, the moisture content of a standard reagent could be accurately quantified. Two types of samples were used for the Karl Fisher titration flask. Using this method, the moisture content of salt can be quantified accurately.
