| http://www.w3.org/ns/prov#value | - The metal compounds can act as the substrate itself, in which case the metal compound makes up 100% of the surface of purifying material P. Examples of metal compounds used in purifying materials P include, without being limited to, metals such as aluminum, magnesium, titanium, zinc, lithium, sodium, vanadium, chromium, molybdenum, tungsten, manganese, lead, bismuth, cobalt, tungsten, cerium, nick
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