| http://www.w3.org/ns/prov#value | - Also, one or more inorganic or organic acids or salts thereof that possess a pH buffering function, e.g., nitrates such as sodium nitrate and ammonium nitrate, etc., boric acid, borax, sodium metaborate, acetic acid, sodium acetate, sodium carbonate, potassium carbonate, phosphorous acid, phosphoric acid, sodium phosphate, citric acid, sodium citrate and tartaric acid, etc., can be included.
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