ISO 2833:1973

Status : Published (Under review)

This standard was last reviewed and confirmed in 2023. Therefore this version remains current.

	Format	Language
std 1 40	PDF
std 2 40	Paper

CHF40

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Abstract

The principle consists in separation of the fluorine from a test portion by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution using sodium alizarinsuphonate and methylene blue as indicators. Alternatively the thorium nitrate titration may be carried out using sodium alizarinsuphonate alone as indicator, the end-point being determined spectrophotometrically under carefully defined conditions. The absorbance at a wavelength of 525 nm shall reach the arbitrary value of 0.6. Has also been approved by the IUPAC.

General information

Status
: Published

Publication date
: 1973-12

Stage
: International Standard confirmed [90.93]
Edition
: 1

Number of pages
: 5
Technical Committee :
ISO/TC 47

ICS :
71.060.50
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