No. 295e Application Bulletin Of interest to: General analytical chemistry, metals / electroplating, iron, etching bath, Fe 2+ , Fe 3+ , steel P 1, 10 Determination of Fe 2+ , Fe 3+ , total and free acid in an etching bath (steel industry) Summary Acid etching baths are used for oxide removal and cleaning of the surface of differ- ent types of steel. To keep the bath in an optimum condition the Fe 2+ /Fe 3+ and free acid/total acid

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