ISO 8215:1985 Preview
Surface active agents -- Washing powders -- Determination of total silica content -- Gravimetric method
This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
From a test portion all ethanol-soluble matter is removed by extraction with ethanol. The solution of the ethanol-insoluble residue is treated with hydrochloric acid and evaporated to dryness. The residue is dissolved in water and the operations are repeated twice. From the solution obtained after this operations the precipitate is filtered, washed, heated to 900 °C and weighed.
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