| http://www.w3.org/ns/prov#value | - Suitable buffering agents or salts useful in maintaining pH include alkali or alkaline earth metal carbonates, chlorides, sulfates, phosphates, bicarbonates, citrates, borates, acetates and succinates such as sodium phosphate, citrate, borate, acetate, bicarbonate, carbonate and tromethamine (TRIS).
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