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ISO 3430:1976 Sodium fluoride primarily used for the production of aluminium -- Determination of silica content -- Reduced molybdosilicate spectrophotometric method
standard by International Organization for Standardization, 08/01/1976
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Specifies a spectrophotometric method, using the reduced molybdosilicate, for determining the silica content of sodium fluoride. Applicable to products of which the phosphorus pentoxide content does not exceed 0,02 % (m/m).