Methods of test for aluminium fluoride for industrial use. Determination of fluorine content.
NORMA vydaná dňa 28.2.1974
Označenie normy: BS 4993-1:1974
Dátum vydania normy: 28.2.1974
Počet strán: 10
Približná hmotnosť: 30 g (0.07 libier)
Krajina: Britská technická norma
Kategória: Technické normy BS
Fusion of a test portion with sodium carbonate and separation of the fluorine by distillation with sulphuric acid. Titration of the distillate with thorium nitrate solution using either sodium alizarinsulphonate with or without methylene blue as masking agents, or methylthymol blue as indicator. Status: Confirmed