| http://www.w3.org/ns/prov#value | - acid and it is salts citric acid and its salts, acetic acid and its salts, tartric acid and its salts, boric acid and its salts, phtalic acid and its salts or organic buffering systems such as TRIS-(hydroxymethyl aminomethane), triethanolamine, 2,4,6 trimethylpyridine, glycin, glycylglycin, diethanolamine, piperazin-1,4-bis(2-ethansulfonicacid), imidazol.
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