| http://www.w3.org/ns/prov#value | - Suitable salts are the metal or ammonium salts of mineral acids or organic acids, especially salts which contain an alkali metal ion, an alkaline earth metal ion, an earth metal ion, or a zinc, copper, iron or manganese ion as the cation, and a sulfate, carbonate, silicate, sulfite, halogenide, phosphate, nitrate, nitrite, acetate, formiate, tartrate, or citrate ion, including their hydrogen salts
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