| http://www.w3.org/ns/prov#value | - 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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