ISO/TC 47 Chemie,
ISO/TC 47 Chemistry,
ISO/TC 47 Chimie,
ISO Internationale Organisation für Normung,
ISO International Organization for Standardization,
ISO Organisation Internationale de Normalisation
ISO 1691
: Sodium and potassium silicates for industrial use; Determination of carbonates content; Gas-volumetric method
- [1976-07-00]
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Medientyp:
Norm
Titel:
ISO 1691
:
Sodium and potassium silicates for industrial use; Determination of carbonates content; Gas-volumetric method
Weitere Titel:
Früher unter dem Titel: ISO/R 1691 (1970-07)
Natrium- und Kaliumsilikate für Industriezwecke; Bestimmung des Carbonatgehaltes; gasvolumetrische Methode
Silicates de sodium et de potassium à usage industriel; Dosage des carbonates; Méthode gazométrique
Anmerkungen:
Internationale Übereinstimmung mit: BS 6092-4 (1981-02-27), IDT*NF T20-524 (1973-12-01), IDT*PN-ISO 1691 (2000-10-04), IDT*SS-ISO 1691 (1993-11-30), IDT*UNE 55626 (1983-11-15), NEQ*KS M ISO 1691 (2012-12-24), IDT*KS M ISO 1691 (2017-12-29), IDT*TS 1209 (1984-12-11), IDT*NBN T 03-236 (1980), IDT
Beschreibung:
Three cases, defined by a preliminary test, are envisaged: silicates containing neither sulphides nor chlorates; silicates containing sulphides; silicates containing chlorates. The method based on boiling of an acidified test portion containing methyl orange and with a lead paper strip in the vapour. The presence of sulphides produces blackening of the paper and the presence of chlorates decolorizes the methyl orange. Volumetric*measurement of carbon dioxide evolved from silicates containing neither sulphides nor chlorates by reaction with a hydrochloric acid solution. The principle for the oxidation of sulphides and the reduction of chlorates are specified.