| http://www.w3.org/ns/prov#value | - Among them, particularly preferable examples of the salt include alkali metal salts such as sodium, potassium and lithium, onium salts of mono-, di- or tri(lower alkanol having 1 to 4 carbon atoms)amine such as monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine and triisopropanolamine, and ammonium salts.
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