Chemistry: analytical and immunological testing – Including sample preparation – Digestion or removing interfering materials
Patent
1997-08-27
1999-03-02
Warden, Jill
Chemistry: analytical and immunological testing
Including sample preparation
Digestion or removing interfering materials
436 83, 436127, 436149, 436150, 436151, 436111, 438 14, 134 2, 134 3, 134 10, 134 13, 134 26, 134 28, 134 29, G01N 100
Patent
active
058770275
ABSTRACT:
An analytical method for the quantitative determination of the impurities in silicon dioxide by which trace amounts of hardly soluble impurities contained in silicon dioxide can be reliably decomposed and converted into a solution so that the contents of all of the impurities contained in silicon dioxide or, in particular, zirconium in a natural quartz powder can be accurately determined. Silicon dioxide is decomposed with hydrofluoric acid or an acid mixture of hydrofluoric acid and another inorganic acid to give a decomposition solution which is, as such or after admixture with another inorganic acid, subjected to evaporation to dryness and the residue is heated to cause fusion with addition of a salt or hydroxide of an alkali metal followed by dissolution of the salt or hydroxide of an alkali metal with pure water or with an aqueous solution of an inorganic acid to give an aqueous solution which is subjected to quantitative analysis of the impurities therein.
REFERENCES:
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Tong S et al Determination of trace impurities at the pph level in fused silica by spark source mass spectrometry Anal. Chem. Acta (1976) 84 (2) 327-33.
Sulcek et al. "Analytical fast methods for determination of metals and inorganic raw materials XVII. Separation of zirconium or silica gel and its determination in silicates" Collect. Czech. Chem. Common. (1969), 34 (6) 1720-30.
Kiriyama, et al T. Anim-exchange separation and spectro photomatric determination of zirconium and uranium in silicate rocks w/arseno II Nippon Kagaku Katshi (1979) (11) 1609-11. Abstract only.
Kemmochi Katsuhiko
Maekawa Kiyotaka
Miyazawa Hiroyuki
Saitou Manabu
Tsuji Chuzaemon
Carrillo S.
Shin-Etsu Quartz Products Co. Ltd.
Warden Jill
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