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ISO 3196:1975

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

May 1, 1975

General information

90.93     Oct 20, 2023

ISO

ISO/TC 47

International Standard

71.060.40  

French   English  

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Published

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Scope

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.

Life cycle

NOW

PUBLISHED
ISO 3196:1975
90.93 Standard confirmed
Oct 20, 2023

National adoptions

SRPS ISO 3196:2016  
ISS

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

90.93   Standard confirmed

H047 more

SRPS H.B8.663:1992  
ISS

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

95.99   Withdrawal of Standard

H047 more