Sur le rôle des composés ferriques et des matières humiques dans le phénomène de la coloration des eaux et sur l'élimination de ces substances sous l'influence de la lumière solaire

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1897), 34(3), 578-600; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010).

Authors investigation in 5 m are enough for pipe diluted solutions of ferric chloride on the one hand and of Humin substances (peat water) on the other hand on their color. One compares the dilution concerned with the content to iron and organic substances of our seas, lakes and flux, then it resulted that the water of these natural runs and basins would have to look to black brown instead of blue to green. An explanation for this difference resulted from the experiment to examine a mixture of diluted ferric salt solution and Humin substances solution for its color. Such a mixture is colored in the beginning dark, but under the influence of light more brightly and more brightly, as turbidity sit down to ground. The Humin substances is oxidized and to connect itself in more highly oxidized with metal oxides to insoluble compounds. With this process ferric oxide is reduced to ferrous oxide, whose color is hardly possible. Ferrous oxide can take up oxygen from air in the natural water again and exercise now as ferric compound its function with the elimination one the Humin substances again. Author compares the achievement of the iron with the purification the natural water with the achievement of hemoglobin in the animal blood.

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