| http://www.w3.org/ns/prov#value | - , such as formic acid, acetic acid, lactic acid or citric acid, or bases, such as alkali metal hydroxides or carbonates, or also aliphatic low-molecular-weight amines, such as those which can be used for the corresponding salt formation of the above-mentioned acid groups, of which ammonia or triethanolamine are preferred.
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