Fruits, vegetables and derived products — Determination of alkalinity of total ash and of water-soluble ash
NORMA vydaná dňa 1.8.1981
Označenie normy: ISO 5520:1981
Dátum vydania normy: 1.8.1981
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy 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.