Abstract
We analyze the origin of the water desorption peaks in NaI above the temperature stability range of the crystalline hydrate NaI · 2H2O. The two water desorption peaks at t ≥ 180°C are shown to arise from the decomposition of aqua complexes based on hydroxyl groups. Such peaks in the pressure-temperature curve provide an effective and sensitive tool for detecting OH groups in raw materials. After prolonged room-temperature dehydration, no such peaks emerge. The dehydration process can be accelerated by microwave drying.
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