Publikuar
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.
PUBLISHED
ISO 1690:1976
90.93
Standard confirmed
20 tet 2023
Silikate natriumi dhe kaliumi për përdorim industrial - Përcaktimi i përmbajtjes së silicit - Metoda gravimetrike sipas shkallës së tretshmërisë
60.60 Standard published
English