| http://www.w3.org/ns/prov#value | - The preferable salt includes an alkali metal salt such as a sodium salt, a potassium salt and a lithium salt; an alkanolamine salt such as a monoethanolamine salt, a diethanolamine salt, a triethanolamine salt, a monoisopropanolamine salt, a diisopropanolamine salt and a triisopropanolamine salt; and an ammonium salt.
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