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The Analytical Separation of Iron and Aluminium by Henry Erdmann Radasch, 1897

The Analytical Separation of Iron and Aluminium by Henry Erdmann Radasch, 1897, Page 36

[page]34[/page]

A sufficient excess of the [?nitrous?]-[?beta?]-naphthol solution should be added in the first place to insure the complete separation of the iron. More is required than is stated in the article. This may be due to the fact that the authors (Knorre and Illinski) allowed the solutions to stand 6 - 8 hours, while in the separations, 2 hours at the most were allowed. With a considerable excess of the precipitant, no iron could be detected in the solution after 2 hours standing. It is best to allow the [?nitrous?]-[?beta?]-naphthol to digest overnight in the acetic acid. This gives a beautiful deep red solution. If too great a heat is used in [?ing?] the solution of the [?nitrous?]-[?beta?]-naphthol, a black tarry mass separates out and the solution is useless. If these precautions are followed, no trouble will be experienced from the precipitant.
       After the addition of the precipitant to the solution, water is added to make the amount of acetic acid below 10%. This important point is not stated in the article.
       At first the results were entirely too low for the iron but the aluminium came out pretty

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[page]34[/page] A sufficient excess of the [?nitrous?]-[?beta?]-naphthol solution should be added in the first place to insure the complete separation of the iron. More is required than is stated in the article. This may be due to the fact that the authors (Knorre and Illinski) allowed the solutions to stand 6 - 8 hours, while in the separations, 2 hours at the most were allowed. With a considerable excess of the precipitant, no iron could be detected in the solution after 2 hours standing. It is best to allow the [?nitrous?]-[?beta?]-naphthol to digest overnight in the acetic acid. This gives a beautiful deep red solution. If too great a heat is used in [?ing?] the solution of the [?nitrous?]-[?beta?]-naphthol, a black tarry mass separates out and the solution is useless. If these precautions are followed, no trouble will be experienced from the precipitant. After the addition of the precipitant to the solution, water is added to make the amount of acetic acid below 10%. This important point is not stated in the article. At first the results were entirely too low for the iron but the aluminium came out pretty