| http://www.w3.org/ns/prov#value | - Examples of the drying agent to be used are hydrate-forming salts, i.e. salts that absorb water as crystallization water; such as phosphates, e.g. sodium dihydrogenphosphate, disodium hydrogenphosphate, trisodium phosphate, trilithium phosphate and sodium pyrophosphate, and anhydrides of the foregoing, other hydrate-forming salts, such as sodium borate and sodium sulfate, and anhydrides thereof; o
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