Fruits, vegetables and derived products — Determination of alkalinity of total ash and of water-soluble ash
NORM herausgegeben am 1.8.1981
Bezeichnung normen: ISO 5520:1981
Ausgabedatum normen: 1.8.1981
Zahl der Seiten: 3
Gewicht ca.: 9 g (0.02 Pfund)
Land: Internationale technische Norm
Kategorie: Technische Normen ISO
Description / 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.