The method is based on evaporation to dryness of a test portion in the presence of hydrofluoric acid and concentrated sulfuric acid, extraction of the soluble salts from the mixture, filtration, drying and weighing of the residual barium sulfate. Applies to products having barium sulfate contents equal to or greater than 0,1 % (m/m).
Status: WithdrawnPublication date: 1992-12
Edition: 2Number of pages: 3
Technical Committee: ISO/TC 175 Fluorspar
- ICS :
- 73.080 Non-metalliferous minerals
ISO 5437:1992Stage: 95.99
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