Determination of zinc in blast furnace flue dusts |
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Authors: | Hitchen A Zechanowitsch G |
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Institution: | Special Analysis Section, Chemical Laboratory, Mineral Sciences Laboratories, CANMET, Ottawa, Canada. |
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Abstract: | Two methods for the determination of zinc in blast-furnace flue dusts are described. One involves a solvent extraction step using methyl isobutyl ketone to separate the zinc from the bulk of the interfering elements, followed by a complexometric titration of the zinc with EDTA, using Eriochrome Black T as indicator. The other employs differential pulse polarography with a hydrochloric acid + pyridine supporting electrolyte. In this method, the interference of iron is prevented by reducing it with hydroxylamine hydrochloride; aluminium is complexed with potassium fluoride. Other elements, with the exception of cobalt, do not interfere. Excellent agreement between the two methods is obtained in the range 0.01–0.6% zinc. |
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