Norm

ISO 5438:1993 en

Acid-grade and ceramic-grade fluorspar - Determination of silica content - Reduced-molybdosilicate spectrometric method

  • Deze norm is ingetrokken sinds 09-08-2010

31,57

Over deze norm

Status Ingetrokken
Aantal pagina's 5
Gepubliceerd op 18-03-1993
Taal Engels
The method specified is based on decomposition of a test portion by fusion with sodium carbonate and subsequent acidification with hydrochloric acid in the presence of boric acid to complex fluoride, formation of the molybdosilicic acid complex and selective reduction to the blue molybdosilicic acid complex with addition of tartaric acid to prevent interference from phosphate, spectrometric measurement of the absorbance of the coloured complex at the wavelength of maximum absorption (about 795 nm). Applies to products having silica contents, expressed as SiO, in the range 0,05 % (m/m) to 4,0 % (m/m).

Details

ICS-code 73.080
Nederlandse titel Acid-grade and ceramic-grade fluorspar - Determination of silica content - Reduced-molybdosilicate spectrometric method
Engelse titel Acid-grade and ceramic-grade fluorspar - Determination of silica content - Reduced-molybdosilicate spectrometric method

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