Résumé
The principle of the method specified is to decompose a test portion by alkaline fusion with sodium carbonate and subsequent acidification with hydrochloric acid in the presence of boric acid to complex fluoride, selective reduction to the blue molybdosilicic acid complex, spectrometric measurement of the absorbance of the coloured complex at a wavelength corresponding to the absorption maximum of approximately 650 nm. Applies to products having silica contents, expressed as SiO2, in the range 0,2 % (m/m) to 30 % (m/m).
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État actuel: AnnuléeDate de publication: 1993-03
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Edition: 2Nombre de pages: 6
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Comité technique: ISO/TC 175 Spath fluor
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- ICS :
- 73.080 Minerais non métallifères
Cycle de vie
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Précédemment
AnnuléeISO 9502:1989
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Actuellement
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