Home

Subscribe to updates

ISO 2833:1973

Sodium fluoride for industrial use -- Determination of fluorine content -- Modified Willard-Winter method

This standard has been reviewed and then confirmed in 2011 
More information

ISO standards are reviewed every five years

Close

Media and price

Format Price Language
PDF CHF 38,00 Add to basket
Paper CHF 38,00 Add to basket

 

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.

 

  • Edition: 1 (Monolingual) ICS: 71.060.50
    Status: Published Stage: 90.93 (2011-10-13)
    TC/SC: ISO/TC 47 Number of Pages: 5
  • No revision information available

  • No corrigenda or amendments available

Preview and follow ISO 2833:1973 on our Online Browsing Platform

Preview


Contact customer services

Send your enquiry by email
or call us on +41 22 749 08 88
09:00 – 12:30, 14:00 – 17:00 (UTC+1).

Related standards

Standards in the same category (71.060.50)
Standards from the same committee