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ISO 2831:1973
Sodium fluoride for industrial use -- Determination of water-insoluble matter
This standard has been reviewed and then confirmed in 2011
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ISO standards are reviewed every five years
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Abstract
The principle consists in dissolution of a test portion, separation of all insoluble matter by filtration of the solution by vacuum through a filter crucible, drying and weighing. Has also been approved by the IUPAC.
