| http://www.w3.org/ns/prov#value | - Examples of the heavy metal are nickel, copper, cobalt, manganese, chromium and zinc, and typical examples of such heavy metal salt are nickel chloride, ferric chloride, ferrous chloride, ferric ammonium sulfate, ferrous sulfate, euprous chloride, cupric chloride, cobalt dichloride and cobaltic chloride.
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