ISO 5520:1981

Published (Edition 1, 1981)

This standard was last reviewed and confirmed in 2018. Therefore this version remains current.

ISO 5520:1981

CHF 42

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Abstract

After incineration of the product at 525 +/- 25 degrees centigrade the method consists in a) in the case of total ash: addition of an excess of standard volumetric sulphuric acid solution and back titration with standard volumetric sodium hydroxide solution, b) in the case of water-soluble ash: extraction of the ash with hot water and neutralization of the aqueous extract with standard volumetric sulphuric acid solution.