| http://www.w3.org/ns/prov#value | - Any of the suitable known complexing agents may be used, including gluconic acid, glucoheptonic acid, tontanic acid, methylene disphosphonate, glyceric acid, glycolic acid, mannitol, oxalic acid, malonic acid, succinic acid, bicine, N,N???-bis(2-hydroxy ethyl) ethylene diamine, citric acid, ascorbic acid and gentisic acid.
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