Studies in the spectrophotometric determination of silicon in materials decomposed by hydrofluoric acid: Loss of silicon by decomposition with hydrofluoric acid

Hydrofluoric acid can be used to dissolve silicon-containing materials without loss of silicon by evaporation. Silicon (present as fluosilicic acid) can then be determined spectrophotometrically as the yellow α-silicomolybdic acid. The loss of silicon from solutions evaporated at room temperature and higher temperatures is also determined.