Norm

ISO 4280:1977 en

Cryolite, natural and artificial, and aluminium fluoride for industrial use - Determination of sulphate content - Barium sulphate gravimetric method

31,57

Over deze norm

Status Definitief
Aantal pagina's 3
Gepubliceerd op 01-11-1977
Taal Engels
Applicable to products having a content, expressed as sulphur trioxide, equal to or more than 0.1 % (m/m). Bases on alkaline fusion of a test portion with a mixture of sodium carbonate and boric acid. Extraction of the fused mass with perchloric acid solution and precipitation of the sulphate ions with barium chloride in an acidified medium. Filtration on a fine-texture, ashless filter paper (pore diameter approximately 0.4 to 1.0 m). Calcination after drying in an electric oven at (850 20) °C. Weighing of the residue.

Details

ICS-code 71.060.50
Nederlandse titel Cryolite, natural and artificial, and aluminium fluoride for industrial use - Determination of sulphate content - Barium sulphate gravimetric method
Engelse titel Cryolite, natural and artificial, and aluminium fluoride for industrial use - Determination of sulphate content - Barium sulphate gravimetric method

Winkelwagen

Subtotaal:

Ga naar winkelwagen