Cryolite (natural and artificial) — Determination of aluminium content — 8- Hydroxyquinoline gravimetric method

Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Language(s)

English, French

Published date

12-01-1972

Publisher

International Organization for Standardization

The method can be applied provided the Fe203 content does not exceed 0,15 . It can also be applied to products with molar ratio of NaF to AlF3 between approximately 3 and 1,7. The principle consists in dissolution of a test portion by acid fusion using potassium pyrosulphate and recovery by hydrochloric acid. Separation of the mixture by precipitation of aluminium, with ammonium benzoate , in an acetic reducing medium. Dissolution of the precipitate and reprecipitation as aluminium tri(quinolin-8-oxide) in an acetic buffer medium. Filtration, washing, drying of the precipitate at a temperature of 130 °C and weighing.

DocumentType	Standard
Pages	3
PublisherName	International Organization for Standardization
Status	Current

Standards	Relationship
NBN T 03 437 : 1983	Identical
BS 5050:1974	Similar to

ISO/TR 4277:2009	Cryolite, natural and artificial Conventional test for evaluation of free fluorides content
PD ISO/TR 4277:2009	Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content