ISO 1690:1976
p
ISO 1690:1976
6306

Abstract

 Preview

The procedure is based on evaporation to dryness of a test portion previously acidified with hydrochloric acid. Dissolution of the soluble salts, filtration and washing of the insoluble matter. Second evaporation of the filtrate and washings under the same conditions, further dissolution of the soluble salts, filtration and washing. Calcination and weighing of the two lots of insoluble matter simultaneously. Volatilization of silica by heating with hydrofluoric and sulphuric acids and weighing of the residue after calcination. The*difference in mass represents the silica present in the test portion.


General information 

  •  : Published
     : 1976-02
  •  : 1
     : 3
  •  : ISO/TC 47 Chemistry
  •  :
    71.060.50 Salts

Buy this standard

en
Format Language
std 1 40 PDF
std 2 40 Paper
  • CHF40

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)