| prov:value
| - The reaction solution can include, if desired, in addition to the above-described components, a complex forming agent or a pH buffer, for example, monocarboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, acrylic acid, trimethylacetic acid, benzoic acid and chloroacetic acid and the salts thereof; dicarboxylic acids such as oxalic acid, succinic acid, malon
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