Abstract
IN the estimation of silica by the colorimetric method of Diénert and Wandenbulcke1, the yellow colour produced by the addition of ammonium molybdate in acid solution has hitherto been attributed to the ions of a heteropolyacid. The fact, easy to establish, that silica sols do not, under these conditions, give an intensity of colour proportional to the silica present, has led to the belief that colloid micellae of silica do not give the reaction, and that the colour intensity is proportional to the crystalloid silica. We believe this view to be incorrect.
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References
C.R. Acad. Sci., 176, 1487 (1923).
Ind. Eng. Chem., Anal. Ed., 6, 384 (1934).
Z. anorg. Chem., 201, 361 (1931).
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TOURKY, A., BANGHAM, D. Colloidal Silica in Natural Waters and the Silicomolybdate Colour Test. Nature 138, 587–588 (1936). https://doi.org/10.1038/138587c0
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DOI: https://doi.org/10.1038/138587c0
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