Active standard | Published: 01/12/1973

ISO 2833:1973

Sodium fluoride for industrial use — Determination of fluorine content — Modified Willard-Winter method
(Fluorure de sodium a usage industriel — Dosage du fluor — Méthode Willard-Winter modifiée)

Available languages: English, French

Available design: electronic design (pdf), Print design

from 56.50 EUR show on eshop

Detail information

Designation: ISO 2833:1973

Publication date: 01/12/1973

Pages: 5

Country: International technical standard

Where to buy?

You can buy at www.mystandards.biz

Anotation

Description / 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.

Popular Publishers

full catalog