| http://www.w3.org/ns/prov#value | - The base may in each case conveniently be a hydroxide or carbonate of sodium, potassium, lithium or ammonium, or an amine, such as methylamine, dimethylamine, ethylamine, diethylamine, trimethylamine, ethylene, diamine, propylamine, ethanolamine, diethanolamine or triethanolamine.
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