| http://www.w3.org/ns/prov#value | - Any of the suitable known complexing agents may be used, including but not limited to gluconic acid, glucoheptonic acid, methylene disphosphonate, glyceric acid, glycolic acid, tartaric acid, mannitol, oxalic acid, malonic acid, succinic acid, bicine, malic acid, N,N'-bis(2-hydroxy ethyl) ethylene diamine, citric acid, ascorbic acid and gentisic acid.
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