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ISO 3196:1975

Sodium hydroxide for industrial use -- Determination of carbonates content -- Titrimetric method

Üldinfo
Kehtiv alates 01.05.1975
Tegevusala (ICS grupid)
71.060.40 Alused
Direktiivid või määrused
puuduvad
Standardi ajalugu
Staatus
Kuupäev
Tüüp
Nimetus
01.05.1975
Põhitekst
Applicable to products having contents, expressed as CO2 , of more than 0.01 % (m/m). Relates to a procduct containing neither sulphides nor chlorates or only sulphides or only chlorates. Preliminary test by boiling an acidified test sample in the presence of methyl orange and with a lead acetate paper strip in the vapour. The sulphides blacken the paper and chlorates delolourize the methyl orange. Products containing neither sulphides nor chlorates: liberation of carbon dioxide by acidification and heating. Entrainment in a flow of gas and absorption in an excess of barium hydroxide solution. Titration of the excess barium hydroxide solution with a standard volumetric hydrochloric acid solution in the presence of thymolphthalein as indicator.
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Ühiskondlik turvalisus. Talitluspidevuse juhtimissüsteem. Nõuded
Kehtetu alates 02.12.2019
Põhitekst

ISO 979:1974

Sodium hydroxide for industrial use -- Method of assay
Uusim versioon Kehtiv alates 01.12.1974
Põhitekst

ISO 981:1973

Sodium hydroxide for industrial use -- Determination of chloride content -- Mercurimetric method
Uusim versioon Kehtiv alates 01.02.1973