International Sugar Journal

Some comments on the colorimetric determination of silicate in cane sugar [Full subscriber]

A standard technique in water analysis, the colorimetric method for determining silica as molybdosilicic acid has often been used in analyzing sugars and other sugar cane process samples. However, in several reports shortcomings of the method were alleged, presumably due to interference by sugars, complexity of the industrial sugar matrix and to limited reactivity of some silicon species with the molybdenate reagent. In this work, both the yellow and blue molybdenate complex methods were reviewed and tested, as well as a method to render more or all colloidal silica in sugar molybdenate-reactive and therefore detectable by the colorimetric method. Unlike…

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