prov:value
| - As examples of such reducing agents, there can be mentioned ethylenediaminetetraacetic acid, its sodium salt and potassium salt, and complexes thereof with a heavy metal such as iron, copper or chromium, sulfinic acid and its sodium salt and potassium salt, L-ascorbic acid and its sodium salt, potassium salt and calcium salt, ferrous pyrophosphate, ferrous sulfate, ammonium ferrous sulfate, sodium
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