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
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Media type:
Standard
Title:
ISO 979
:
Sodium hydroxide for industrial use; Method of assay
Other titles:
Früher unter dem Titel: ISO/R 979 (1969-02)
Natriumhydroxid (Natronlauge, Ätznatron) für Industriezwecke; Bewertungsmethode
Hydroxyde de sodium à usage industriel; Détermination du titre
Footnote:
Internationale Übereinstimmung mit: BS 6075-1 (1981-02-27), IDT*GB/T 11213.1 (2007), MOD*NF T20-422 (1976-11-01), IDT*JIS K 1200-2 (2000-07-31), MOD*PN-ISO 979 (2002-11-05), IDT*UNE 55601 (1978-02-15), NEQ*KS M ISO 979 (2002-12-17), IDT*KS M ISO 979 (2017-12-29), IDT*ELOT 536 (1982), IDT*NBN T 03-121 (1980), IDT*NS 9042 (1981), MOD*SFS 3789 ISO 979 (1983), IDT
Description:
Method for determination of the titre; this is expressed conventionally as percentages by mass of NaOH, a) as total alkalinity and b) as caustic alkalinity, corresponding to the total alkalinity less the alkalinity due to carbonates. The principle consists in titration of the total alkalinity with standard volumetric hydrochloric acid solution in the presence of methyl orange as indicator. Calculation of the two amounts a) and b). The mass of carbon dioxide is determined by the method specified in ISO 3196. This method has also been approved by the IUPAC. - Cancels and replaces ISO Recommendation R 979-1969 of which it constitutes a technical revision.