Acid decomposition procedure for the spectrophotometric determination of silica in rocks and minerals at room temperature

An acid decomposition procedure at room temperature for the spectrophotometric determination of silica in rocks and minerals is described. The sample solution is prepared by treatment with hydrofluoric acid and aqua regia at room temperature. Unreacted fluoride ions are complexed with boric acid and...

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Bibliographic Details
Published in:Analytica chimica acta 1992-10, Vol.268 (2), p.357-359
Main Authors: Rao, C.R.M., Reddi, G.S., Rao, T.A.S.
Format: Article
Language:English
Subjects:
Acid decomposition
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochemistry
Geochemistry: general, methodology, regional studies
Geological materials
Minerals
Rocks
Sample preparation
Silica
UV-Visible spectrophotometry
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Summary:An acid decomposition procedure at room temperature for the spectrophotometric determination of silica in rocks and minerals is described. The sample solution is prepared by treatment with hydrofluoric acid and aqua regia at room temperature. Unreacted fluoride ions are complexed with boric acid and the silica is determined by the molybdenum blue method. Accurate values were obtained for a number of international reference standards. The entire procedure is carried out at room temperature. Only plastic ware is used for the decomposition of the samples. The method is thus ideal for large batch analyses.
ISSN:0003-2670
1873-4324
DOI:10.1016/0003-2670(92)85232-U