| http://www.w3.org/ns/prov#value | - The component can be an inorganic compound such as an inorganic ion, either cation or anion, for example, metal ions including alkali metal ions such as lithium, potassium, sodium, etc., alkaline earth metal ions such as magnesium, calcium and so forth, copper, cobalt, manganese, aluminum, iron (ferrous or ferric), chromium, nickel, zinc, cadmium and so forth, and non metal ions such as halides (c
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