ニトロソナフトールによる微量鉄の溶媒抽出-吸光光度定量

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Simple determinations of ppm quantity of iron have been investigated by use of solvent extraction and light absorbancy method with nitrosonaphthols.<BR>The complex of α-nitroso-β-naphthol and ferrous iron could be extracted completely with a mixed solvent of ethyl acetate and butyl acetate in the pH range 4.310. 0 and it gave a stable solution. having a maximum absorption at 660 mμ. On the other hand, extraction of the complex of, β-nitroso-α-naphthol and ferrous iron with the same solvent gave only an unstable solution and methyl-isobutylketone was used for this purpose. The extraction was complete in the pH range 4.910.0 and it gave a stable solution having the maximum absorption at 670 mμ. These methods, however, were not applicable for the determination of ferrous and ferric irons separately. As examples of the applications, estimations of trace amounts of total iron in reagent acids and alkalies were made.
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