Determination of Free and Total Water in Fertilizers by Karl Fischer Titration

Abstract

Free water in fertilizers is determined by extraction of the sample with 1,4-dioxane and titration of the extract with Karl Fischer reagent. Total water is determined by distillation of n-amyl alcohol from its mixture with the sample and titration of the distillate with Karl Fischer reagent. Hydrate water is taken as the difference between the total water and the free water.