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ISO 5520:1981
ISO 5520:1981 Fruits, vegetables and derived products -- Determination of alkalinity of total ash and of water-soluble ash
standard by International Organization for Standardization, 08/01/1981
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M00059928
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Full Description
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.
